The statement, "in frederick griffith experiment (1928), when he killed pathogenic bacteria, then mixed the bacterial remains with living harmless bacteria, some living bacterial cells became pathogenic" is true.
How do bacteria work?One of the simplest and most common life forms on Earth is bacteria. These are microorganisms with a solitary cell. They are found almost everywhere, including in soil, water, and human tissue. Bacteria come in a wide variety of sizes and shapes, including spheres, rods, and spirals. While certain bacteria are advantageous to humans and aid in digestion, others are pathogenic. In order to reproduce, bacteria split into two, a process known as binary fission.
Frederick Griffith discovered in a 1928 experiment that some living bacteria turn pathogenic when combined with the bacterial leftovers of deceased pathogenic bacteria. Griffith observed that when living, harmless bacteria were mixed with harmful, heat-killed bacteria, the genetic material from the dead bacteria was absorbed, transforming the living bacteria from harmless to pathogenic. This phenomenon, which became known as transformation, provided the earliest experimental evidence that DNA exists as the genetic material in cells. Griffith's work was a significant turning point in the study of genetics and paved the way for further research.
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Use the genetic-distance matrix that follows to establish the taxonomic relationships between the species listed. (Hint: Draw a phylogenetic tree to illustrate these taxonomic relationships.)
A B C D
B 4.8 —
C 0.7 5.0 —
D 3.6 4.7 3.6 —
The taxonomic relationships can be established as follows: species A is the most distant from the other three, while species B, C, and D are more closely related to each other.
Based on the genetic-distance matrix, the phylogenetic tree can be drawn as follows:
A
/ \
C D
\ /
B
This indicates that species A is the most distantly related to the other three species, while species B, C, and D are more closely related to each other. Species B is the closest relative of species C, and species D is more closely related to species C than to species B. Therefore, the taxonomic relationships can be established as follows: species A is the most distant from the other three, while species B, C, and D are more closely related to each other, with B and C being the closest relatives, and D being more closely related to C than to B.
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Many different types of micro-organisms can disrupt the function of the gastrointestinal tract. V. cholera is a good example, causing short acute bouts of dizziness, disorientation, and diahrrea that, if untreated, can even be fatal, The cholera organism itself is a(n) a) bacterium. b) fungus. c) virus. d) parasite. e) worm, f) tick.
The gastrointestinal tract's ability to function can be interfered with by a wide variety of microorganisms. V. Can possibly be lethal if left untreated, A bacterium is causes cholera.
What exactly are micro organism ?Microorganisms include bacteria, viruses (sometimes called germs), fungus, and nematodes. Most of the time, there is no greater risk of contracting an infection at work than there is in anyone other public setting, therefore there is usually no need for you to take any precautions.
What are the seven main categories of soil microorganisms?Below is a list of the primary categories of microorganisms, including bacteria, archaea, fungus (actinomyces), algae, protozoa, among viruses. There are links to articles with further information about each main group.
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Global winds appear all over the world because of the following reasons: (choose more than one)
Question 1 options:
A) Pressure differences
B) Uneven heating of the Earth's surface
C) Air above land heats more quickly
D) Coriolis Effect
According to the research, the correct answer is Option A and B. Global winds appear all over the world because of the pressure differences and uneven heating of the Earth's surface.
What are Global winds?It is a meteorological phenomenon caused by temperature differences in the atmosphere, which gives rise to pressure differences and air movement.
In this sense, the movement of these atmospheric air masses is caused by pressure differences, beginning at the equator and heading towards the tropics, deviating to the right to finally complete the cycle of the trade winds.
Therefore, we can conclude that according to the research, Global windsis the air current that is produced by pressure differences in the atmosphere giving rise to movements of air masses.
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Which of the following best explains how soil can stop acid rain runoff from reaching streams and rivers?
Responses
Organic matter in soil will use the acid for rapid decomposition before it reaches streams and rivers.
Highly-acidic soils will neutralize the new type of acid before it can reach streams and rivers.
Low-acid soils will absorb and neutralize the acid water in its pores before it can reach streams and rivers.
Compacted soil formations like dense hills will make it impossible for acid rain to reach streams and
Option c Low-acid soils will absorb and neutralize the acid water in its pores before it can reach streams and rivers. best explains how soil can stop acid rain runoff from reaching streams and rivers.
What is acid rain and how nature can neutralize it?The expression acid rain makes reference to the precipitation of water including acidic compounds and nature can neutralize it by basic products.
Therefore, with this data, we can see that acid rain can be neutralized in nature by neutral low acid soils that absorb the excess of acidity.
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Answer: The correct answer is Low-acid soils will absorb and neutralize the acid water in its pores before it can reach streams and rivers.
Explanation: This answer has been confirmed as correct.
Two weeks ago, a 5-year-old boy developed diarrhea, which has persisted to the present time despite dietary management. His stools have been watery, pale, and frothy. He has been afebrile. Microscopic examination of his stools show??
Diagnosis: Cryptosporidium
- important cause of diarrhea in immunocompromised patients (AIDS) and immunocompetent pts.
- responsible for epidemics of diarrhea
NOTE: Salmonella sonnei can be grown in culture, but microscopy is not helpful other than finding fecal leukocytes.
Diagnosis: Cryptosporidium is a significant contributor to outbreaks of diarrhea in both immunocompetent persons (such as those with AIDS) and immunocompromised patients.
Although Salmonella sonnei may be cultured, microscopy is only useful for identifying fecal leukocytes. Chronic diarrhea can be brought on by some illnesses, dietary allergies and intolerances, digestive system issues, abdominal surgery, and long-term medication usage. Some parasitic and bacterial illnesses that cause diarrhea take longer to heal without therapy. Escherichia coli, Shigella, Salmonella, Campylobacter (most common in children), Yersinia, and Clostridium spp. are the most often found pathogens that cause bacterial diarrhea. Shiga-producing E may most frequently cause traveler's diarrhea.
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skin features that help to protect the body from microorganisms include . select all that apply.
Skin features that help to protect the body from microorganisms include stratified epithelial tissue, presence of secretions of sebaceous glands, etc.
Strata of the epidermis that occurs from the deepest layer to the most superficial includes- 1. Stratum Basale. 2. Stratum Spinosum. 3. Stratum Granulosum. 4. Stratum lucidum. 5. Stratum corneum.
We can consider the skin as the body's largest and primary protective organ, covering its entire external surface and serving as a first-order physical barrier against the environment. The functions of the skin include temperature regulation and protection against ultraviolet (UV) light, trauma, pathogens, microorganisms, and toxins. The skin provides protection against microorganisms, dehydration, ultraviolet light, and mechanical damage. Also the skin is the first physical barrier that the human body has against the external environment.The skin, in the absence of microbes, is not capable of fending for itself. It requires commensals that are beneficial microorganisms to promote immunity against infection.
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Choose the evidence that supports that the polyploidy sunflower species, Helianthus anomalus, is a true biological species formed sympatrically by hybridization of the parental polyploidy sunflower species, H. petiolaris and H. annuus.
The striking finding that transposon multiplication might add to speciation came from an investigation of the sunflower and its species half and halves (Rieseberg et al., 1995).
The cross-breed sunflower species Helianthus anomalous was delivered by the hybridization of H. annuus and H. petiolaris.
Organic entities might seem, by all accounts, to be indistinguishable and be various species. For instance, Western meadowlarks (Sturnella neglecta) and Eastern meadowlarks (Sturnella magna) look practically indistinguishable from each other, yet don't interbreed with one another — along these lines, they are independent species as indicated by this definition.
The sunflower (Helianthus annus) is an individual from the Compositae or daisy family. It is accepted to have started in North America, where it was developed by the local Indians and was acquainted with Europe in the sixteenth hundred years.
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Which heart valve is located between left atrium and ventricle?
a. pulmonary valve
b. aortic valve
c. tricuspid valve
d. mitral valve
The heart valve located between the left atrium and the ventricle is the mitral valve. Option D
What is the mitral valve?The mitral valve is one of the heart valves that is located between the left atrium and ventricle. It is also known as the bicuspid valve.
The mitral valve is so named because it resembles a bishop's mitre, a type of ceremonial headdress, and it has two flaps or cusps that open and close to regulate blood flow between the left atrium and ventricle.
During diastole, when the heart is relaxed, the mitral valve is open to allow blood to flow from the left atrium to the left ventricle. During systole, when the heart contracts, the mitral valve closes to prevent blood from flowing back into the atrium and to allow blood to be pumped out to the rest of the body through the aorta.
Dysfunction of the mitral valve can lead to a variety of heart conditions, including mitral valve prolapse, mitral regurgitation, and mitral stenosis, which can impair the heart's ability to pump blood efficiently.
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Why does the greenhouse effect impact temperatures in the lower atmosphere and on Earth's surface the most?
1. Because water vapor and carbon dioxide are usually found in the lower atmosphere and close to the surface
2. Because every surface on earth absorbs solar energy.
3. Because this is where the highest concentration of living things are.
Greenhouse effect impacts temperatures in lower atmosphere and on Earth's surface the most : 1.) Because water vapor and carbon dioxide are found in the lower atmosphere and close to the surface.
How does greenhouse effect influence Earth's surface temperature?Because water vapor and carbon dioxide are found in the lower atmosphere and close to surface, they absorb and trap heat radiated from Earth's surface, hence causing temperatures to increase in this region. This effect is known as the greenhouse effect and is the main reason why temperatures in lower atmosphere and on Earth's surface are impacted the most.
Greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.” These heat-trapping gases can be thought of as blanket wrapped around Earth.
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When comparing the diffusion rate of a substance at differing concentrations within a liquid (Select all that apply) Check All That Apply the diffusion rate will increase with a higher concentration of the substance the diffusion rate will decrease with a higher concentration of the substance the diffusion rate will increase with a lower concentration of the substance the diffusion rate will decrease with a lower concentration of the substance
the diffusion rate will increase with a higher concentration of the substance comparing the diffusion rate of a substance at differing concentrations within a liquid
How do concentration and diffusion rate differ?
As the concentration difference grows, so does the rate of diffusion. Particles move and mix more quickly at higher temperatures because they have more kinetic energy. The rate of diffusion rises as the surface area increases.
In terms of cell transport, diffusion is the movement of small molecules across the cell membrane. The "concentration gradient" denotes the difference in molecule concentration between the two locations.
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using your ph data from the ph enzyme lab, which statement(s) below are true? (select all that apply.)
using your ph data from the pH enzyme lab:
Catalase works best at pH 7.
Catalase works better in alkaline environments than acidic ones.
these statement(s) are true.
What is Effect of pH on enzyme activity?Each enzyme has an ideal pH, but it also has a range of pH levels within which it may continue to function. The type of enzyme will determine this. In the highly acidic environment of the stomach, the pepsin enzyme breaks down proteins. The optimal pH for pepsin is 2.5, while its operational pH range is between 1-4.
The level of pH has a significant impact on how active enzymes are. When the pH is changed, amino acid molecules and atoms become ionized, which affects the shape and structure of proteins and interferes with their functions.
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if the ______ hat is found in ______is genetically similar to ______ and if _______ poisons them, it is reasonable to hypothesize that _____ will poison the ______ and potentially kill _____. because humans have no ______, this would be a good treatment strategy for malaria, provided that the _______ produces no other effects that would be detrimental to humans.
apicoplast
Plasmodium chloroplasts
glyphosate
humans
If the apicoplast hat is found in Plasmodium chloroplasts is genetically similar to chloroplasts, and if glyphosate poisons them, it is reasonable to hypothesize that glyphosate will poison the apicoplast and potentially kill Plasmodium.
Because humans have no apicoplast, this would be a good treatment strategy for malaria, provided that the glyphosate produces no other effects that would be detrimental to humans. The apicoplast is an organelle that is found in the cells of the malaria parasite, Plasmodium. It is similar in structure and function to chloroplasts, which are found in the cells of plants and algae. The apicoplast is necessary for the survival of the malaria parasite, as it is involved in the synthesis of fatty acids and other essential molecules. Glyphosate is a widely used herbicide that works by inhibiting an enzyme involved in the synthesis of amino acids. This enzyme is present in chloroplasts, and is also found in the apicoplast of Plasmodium. By inhibiting this enzyme in the apicoplast, glyphosate can potentially kill the malaria parasite.
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Between 1881 and 1921, one major cause of the increasing number of immigrants to the United States was theanswer choicesavailability of free land in the Southeastincreased job opportunities in industryincreased need for military personnelfederal aid to pay the housing costs of new arrivals
One of the major causes for the increasing number of immigrants in the united states between 1881 and 1921 was increased job opportunities.
During this period united states were experiencing the industrial revolution which created high demand for labor in mines, factories, and other industries. Many people from low-income countries came to the united states in search of jobs and other opportunities.
The government of the united states also supported the immigrants by providing them incentives to settle in certain parts of the country by passing acts such as the Homestead Act of 1862. But soon after because of a large number of immigrants problems such as overcrowding, racial differences, and cut-throat competition for jobs started in the united states.
Although the question is incomplete so I have put the correct question -
Between 1881 and 1921, one major cause of the increasing number of immigrants to the United States was the
1. availability of free land in the Southeast
2. increased job opportunities in the industry
3. increased need for military personnel
4. federal aid to pay the housing costs of new arrivals
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Some gold used for jewelry is called '18-karat white gold'. This alloy is 75% gold (Au), 12.5% silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a ring, how many grams of each metal would you need to start with?
To make 25 grams of 18-karat white gold, you would need:
18.75 grams of gold (75% of 25 grams)3.125 grams of silver (12.5% of 25 grams)3.125 grams of copper (12.5% of 25 grams)What is white gold?White gold is a type of gold alloy that is made by combining gold with other white metals such as silver, nickel, or palladium. The combination of these metals gives the gold a white appearance, which can be desirable for jewelry.
The gold content in white gold is expressed in karats, with 18-karat being a common choice for jewelry. This means that 18-karat white gold contains 75% gold, with the remaining 25% being made up of other metals. White gold is often plated with rhodium, a hard, white metal, to give it an even whiter appearance and to protect the surface from scratches and tarnishing.
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there are four major classes of chemotherapeutic drugs to treat cancer. classify chemotherapy drugs based on their interaction with the cell cycle.
Generally there are four main therapeutic drugs to treat cancer. They are: Alkylating agents, Antimetabolites, Natural products, Hormones.
The treatment of cancer is complicated in that the target human cells, albeit cells that have undergone genetic changes due to apply of certain drugs , are generally dividing at a fast and uncontrolled rate. But certain anticancer drugs can differentiate between normal tissue cells and cancer cells. In some instances this can be due to the rate at which cancer cells proliferate can play a role in the apparent selectivity of agents. If we say alkylating agents, that act on cells at all stages of the cell cycle, actually appear to be most toxic to cells in the synthesis, or synthetic stage therefore when DNA is in the process of replicating and unpaired nucleotides are most vulnerable to alkylation.
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FILL IN THE BLANK. The __ is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell.
Answer: Plasma Membrane
Explanation:
when examining evolutionary relationships, taxonomists strive to classify organisms according to
When examining evolutionary relationships, taxonomists strive to classify organisms according to their characteristics and evolutionary history.
What is taxonomy?Tаxonomy is the scientific method of clаssifying аnd nаming living orgаnisms by grouping them by shаred trаits or chаrаcteristics. This includes morphologicаl (structurаl) chаrаcteristics, the genetic informаtion of the orgаnism, аnd evolutionаry relаtionships with other species.
Tаxonomy is orgаnized using different levels, which progressively become less comprehensive but more specific to the type of orgаnism. The subject of tаxonomy is importаnt for scientists becаuse it helps in studying аnd аnаlyzing аll currently described species more closely аnd аlso gаining а better understаnding of biodiversity, which refers to аll species on eаrth.
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Identify when mutations that involve DNA coding to Amino Acids occur when
Mutations that involve DNA coding to amino acids occur during the process of transcription and translation.
What is mutation?A mutation is a permanent change in the DNA sequence that makes up a gene. Mutations can occur spontaneously, or they can be caused by exposure to certain environmental factors, such as radiation or chemical mutagens. Mutations can be beneficial, harmful, or have no effect on the organism, depending on the nature and location of the change in the DNA sequence.
Mutations can result in the creation of new traits or the loss of existing traits, and they play an important role in evolution. Some mutations can lead to genetic disorders or diseases, while others can have no effect on the organism. Mutations can also be passed down from generation to generation, making them an important factor in the inheritance of traits and the evolution of species.
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Your question is incomplete, but most probably your full question was:
Identify when does the mutations that involve DNA coding to Amino Acids occurs?
Please select all of the true statements for a comparison between Lanes 3 and 5 in the gel you drew.
- Lane 3 and Lane 5 are the same with regards to their banding pattern (the number and placement of bands). - Lane 3 and Lane 5 are different with regards to their banding pattern (the number and placement of bands). - There is the same amount of DNA present in lane 3 and lane 5. - There is more DNA present in one lane than the other. - If a difference in intensity of the bands on the gel was visible, lane 3 would have a brighter/thicker/more intense band.
- If a difference in intensity of the bands on the gel was visible, lane 5 would have a brighter/thicker/more intense band.
The band in lane 5 would be brighter, thicker, and more intense if there was a difference in the bands' intensities visible on the gel.
Describe the visible bands?This electromagnetic radiation's small wavelength ranges from around 400 nanometers (UV) to about 700 nanometers (red). The visible spectrum's many color components roughly fall into the following wavelength ranges: Red: 610 - 700 nm. Orange: 590–610 nanometers. Color yellow: 570–590 nm.
What advantages does visible offer?Visible light is used for a variety of significant purposes in addition to sight. To create lasers for use in anything from surgery to Cassette players to laser pointers, we concentrated visible light. The screens on our TVs, computers, and smartphones are also operated by visible light waves.
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which enzyme breaks down triglycerides in the capillaries of adipose tissue? please choose the correct answer from the following choices, and then select the submit answer button. answer choices lipoprotein amylase lipoprotein lipase bile acid lipoprotein pepsin
Answer: lipoprotein lipase
Explanation:
Which of the following is an adaptation to increase the surface area of a part of a cell that is involved in cellular respiration?
A) the cristae of a mitochondrion
B) the outer membrane of a chloroplast
C) the grana of a chloroplast
D) the endoplasmic reticulum
The correct answer is A) the cristae of a mitochondrion. The cristae are folded inner membranes of the mitochondria that increase the surface area available for cellular respiration.
What is cellular respiration?
Cells generate ATP through a process called cellular respiration, which takes place in the mitochondria. The cristae's larger surface area makes it possible for additional electron transport chains and respiratory enzymes to be present, improving the efficiency of cellular respiration. This is significant because ATP is necessary for a variety of biological functions, such as protein synthesis, DNA replication, and muscle contraction. Cellular respiration does not involve the endoplasmic reticulum (D) or the outer membrane of a chloroplast (B).
The grana of a chloroplast (C) are stacks of thylakoid membranes that are engaged in photosynthesis, the process by which plants synthesize glucose and oxygen from sunlight, water, and carbon dioxide. They are not involved in cellular respiration.
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Which of the following explains why two air masses are likely to stay separated from one another?
A. temperature differences
B. moisture differences
C. density differences
D. pressure differences
Getrude knows that the pH of blood is normally 7.35-7.45. She sees that her blood test results show 7.57 as her blood plasma pH. a. Is Gertrude's blood too acid or too alkaline? too b. Does her blood plasma have too many H+ (hydrogen) ions, the right amount, or not enough? c. Does her blood plasma have too many HCO, (bicarbonate) ions, just the right amount, or not enough?
Gertrude's blood is too alkaline because a pH of 7.57 is above the normal range of 7.35-7.45. b. Her blood plasma has not enough H+ (hydrogen) ions, whereas, her blood plasma have too many HCO3, (bicarbonate) ions.
In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. pH has historically stood for "potential of hydrogen" (or "power of hydrogen"). Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.
The concentration of hydrogen ions in the solution is shown inversely by the pH scale, which is logarithmic.
[tex]{\displaystyle {\ce {pH}}=-\log(a_{\ce {H+}})=-\log([{\ce {H+}}]/{\ce {M}})}[/tex]
where, M= mol dm^-3.
Acidic solutions are those with a pH below 7, and basic solutions are those with a pH above 7, at a temperature of 25 °C (77 °F). At this temperature, solutions with a pH of 7 are neutral (i.e., have the same amount of H+ ions as OH ions, or the same amount as pure water). The pH neutrality relies on temperature, falling below 7 if the temperature rises above 25 °C. For very concentrated strong acids, the pH value can be less than 0; for very concentrated strong bases, it can be higher than 14.
The kidneys are in charge of the base HCO3. The blood's pH rises and becomes more alkaline as HCO3 levels rise. The blood's pH lowers and its acidity increases when HCO3 levels drop.
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many proteins that are synthesized in the rough er and destined for secretion or the cell membrane are transported through the cell to their final destination by means of [ select ] , which arise from pinching off sections of er or golgi membranes.
The RER is also close to the Golgi apparatus, which transports, alters, and bundles proteins before delivering them to specific locations. Numerous proteins are packed into vesicles and transferred to the Golgi apparatus after being produced in the RER.
The Golgi apparatus , also known as the Golgi complex, Golgi body, or simply the Golgi, is a cellular organelle found in all eukaryotic cells. It is a component of the cytoplasmic endomembrane system that bundles proteins into membrane-bound vesicles before they are transported to their destination. It is located at the crossroads of the secretory, lysosomal, and endocytic pathways.
It is especially important in the processing of proteins for secretion because it contains a collection of glycosylation enzymes that bind different sugar monomers to proteins as they go through the apparatus.
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Classify the following descriptions of enzyme inhibition as either reversible inhibition or irreversible inhibition. Reversible inhibition : Irreversible inhibition :- forms a covalent bond with the enzyme - forms a hydrogen bond with the enzyme - can interfere with the production of vital cellular resources - used by the cell to regulate metabolic processes- permanently modifiest the structure of the active site- can be remove from the active site modifies the dilution with substrate structure
Reversible inhibition involves the formation of hydrogen bonds, regulation and removal from active site whereas irreversible inhibition involves formation of a covalent bond, permanent modification and interference with the production of cellular products.
Reversible inhibition is basically a type of inhibition in enzymology which can be reversed. It involves the formation of hydrogen bonds with the enzyme. In this type of inhibition, the inhibitor can be basically removed from the active site which modifies the dilution with the substrate structure. The cell used this to regulate metabolic processes.
Irreversible inhibition is the one which cannot be reversed and involves the formation of covalent bonds with the enzyme and cannot be removed from the active site and permanently alters the structure. It also interferes with the normal production in the cell.
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This type of signaling has a memebrane-bound signalling molecule that is created by one cell and is intended to reach another cell to cause an effect. A. Paracrine B. Neuronal C. Contact Dependent D. Endocrine
A. Paracrine. Local cells engage in paracrine signaling, which causes rapid responses and short-lived signals because the paracrine ligands degrade quickly.
Tyrosine kinase receptors in the area dimerize after being bound by signaling molecules to their extracellular domains. Tyrosine residues on the intracellular domain of the receptors are then modified with phospholipids, which can then relay the signal to the subsequent messenger in the cytoplasm. Cells can interact with one another through a process known as "paracrine signaling," which involves the release of signaling molecules that attach to and activate neighboring cells. Nitric oxide signaling in blood arteries, synaptic communication of neurons, the blood clotting system, tissue repair/wound healing, and local allergic skin responses are prominent examples of paracrine signaling.
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would you consider the relationships between changes in CO2 and Global Temperatures to be causal or correlational? EXPLAIN your answer in complete sentences.
The relationship between changes in CO2 and global temperatures is a complex and multi-faceted one, and scientists generally consider it to be both causal and correlational. On the one hand, there is strong evidence that increasing levels of CO2 in the atmosphere can cause a warming of the planet through the greenhouse effect, which is a well-established scientific principle. This is a causal relationship, as the increase in CO2 is causing a change in global temperatures.
On the other hand, there is also evidence to suggest that changes in global temperatures can impact the levels of CO2 in the atmosphere. For example, when the Earth warms, it can cause the release of CO2 from the ocean, which can then contribute to further warming. This is a correlational relationship, as changes in global temperatures are associated with changes in CO2, but one does not necessarily cause the other.
In conclusion, the relationship between changes in CO2 and global temperatures is both causal and correlational, with both factors having the potential to impact the other. It is important to understand this complex relationship in order to develop effective strategies for mitigating the effects of climate change.
Which of the following observations would suggest that a plate was inoculated with a pure (axenic) culture? A. Bacterial growth is apparent along the streaks connecting each quadrant B. Isolated colonies are all white in color and about the same size C. Bacterial growth is apparent in all four quadrants. D. Isolated colonies are all white in color, but some colonies are noticeably larger than others.
The best answer to the question is D. Isolated colonies are all white, but some colonies are noticeably larger than others the observations would suggest that a plate was inoculated with a pure (axenic) culture.
This is because a pure (axenic) culture will result in colonies of the same organism being visibly different in size. An axenic culture contains only one specific organism, so all colonies should be of the same species and thus, of the same size.
The presence of colonies of different sizes is a sign that the inoculated plate was a pure culture, as different species will have different growth rates and thus different colony sizes.
A is incorrect because the presence of bacterial growth in the streaks connecting the quadrants is not a reliable indicator of a pure culture.
B is incorrect because all the colonies being the same size does not necessarily indicate a pure culture, as multiple species may have similar growth rates.
C is incorrect because bacterial growth in all four quadrants does not indicate a pure culture, as multiple species may also have similar growth rates.
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how did kennedy and rothman demonstrate that newly synthesized bacterial membrane phospholipids rapidly cross from the cytoplasmic side to the external side of the membrane (see fig. 9-35)?
Kennedy and Rothman show that newly synthesised bacterial membrane phospholipids rapidly cross from the cytoplasmic side to the external side of the membrane, and that growing bacteria were briefly exposed to radioactive phosphate to label newly synthesised phospholipids
The cells were then treated with TNBS, a membrane-impermeable reagent that interacts with PE. Cell samples were analyzed for the presence of 32P-labeled PE that also contained the TNB group at various periods. After three minutes, the presence of doubly labelled PE indicated that PE was generated on the cytoplasmic side of the membrane, crossed the membrane, and interacted with TNBS in the extracellular media.
There are several discrepancies in the phospholipid biosynthesis routes of prokaryotes and eukaryotes, as well as within prokaryotes. Two de novo biosynthetic pathways, known together as the Kennedy Pathway, were discovered over 60 years ago or are responsible for the bulk of phosphatidylcholine (PC) & PE synthesis in most eukaryotic cells.
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The hormones synthesized by the indicated endocrine gland that are stored and released by the posterior pituitary area. thyroid stimulating hormone (TSH)b. ACTHc. aldosteroned. oxytocine. corticosteroids
The indicated hormone is the hypothalamus which produces oxytocin which gets secreted as well stored by the posterior pituitary gland.
The correct option is option d.
The hypothalamus is basically an area of the brain, an endocrine gland which performs the function of producing hormones which are able to control heart rate, mood, hunger and even the body temperature. Oxytocin is basically a hormone which is synthesized by the hypothalamus.
Oxytocin is stored as well as secreted by the posterior pituitary gland. The posterior pituitary gland also secretes one other hormone which is the vasopressin. Oxytocin is basically involved in the stimulation of the uterine contractions during labor as well as childbirth.
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