Answer:
The answer is A.
Explanation:
The lac repressor protein can prevent or let the transcription and production of the operan. When there is lactose not present in the body, the lac repressor protein prevents the production of the operan by RNA polymerase but when lactose is present, it let's the operan to get produced . So the answer is yes, the presence of the lactose molecule controls whether the operon is on or off.
I hope this answer helps.
In A Oil Spill why Does the Oil not mix with the Sea Water A.Lipids are hydrophobic. A.Lipids are hydrophilic. A.Lipids are saturated. A.Lipids are unsaturated.
Answer: A. lipids are hydrophobic
Which of the following are correct regarding carbohydrates?
Answer:
Anomeric carbon comes from the corresponding aldehyde or ketone
How many genetically different kinds of sperm could be produced by a Drosophila melanogaster male (XY)
Answer:
The correct answer is - 16 genetically different kinds of sperm could be produced by a Drosophila melanogaster male (XY).
Explanation:
There are four pairs of chromosome in Drosophila melanogaster. In this species homologous chromosomes pair and segregate but do not follow recombination or crossing over. Each chromosome has two alleles or copies so as we know there are four pairs of chromosomes, then total number of chromosome copies would be 8, then
number of different combinations = 2^n (n = number of homologous pairs
)
2^n
= 2^4
= 16
Thus, the correct answer would be : 16.
Which is an innovation of gymnosperms?
Gymnosperms are the first seed plants.
Gymnosperms are the first flowering plants.
Gymnosperms are the first vascular plants.
Gymnosperms are the first spore-bearing plants.
An inmovatuon of gymnosperms is that gymnosperms are the first flowering plants which produce seeds and fruits from their flowers.
What are gymnosperms?Gymnosperms are flowering plants which produce seeds and fruits from their flowers.
The development of flowers in gymnosperms was very significant as it helped in the propagation of the plants.
The flowers attracted pollinators and the fruits too attracted seed dispersers. As a result gymnosperms became dominant among plants.
Therefore, gymnosperms are the first flowering plants.
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Answer:
B. first flowering plants
Explanation:
Edge 2023
What type of imumity is present at birth?
Answer:
Innate immunity
Explanation:
This is your body's first line of defense against germs when you are born. It includes physical barriers, such as skin and mucous membranes, and special cells and proteins that can recognize and kill germs.
The graph shows world fish production from both wild capture and aquaculture. What would happen if a genetically modified fish that grew rapidly to a large
size was introduced into aquaculture? Why?
A. Aquaculture will increase more rapidly due to the new fish’s rapid growth and economic value.
B. Aquaculture will increase more slowly due to the new fishes ability to outcompete wild fish.
C. Aquaculture will decrease more rapidly due to the new fishes ability to outcompetes wild fish.
D. Aquaculture will decrease more slowly due to the new fishes rapid growth and economic value.
Answer:
A. Aquaculture will increase more rapidly due to the new fish’s rapid growth and economic value.
Explanation:
The introduction of genetically modified fish would further promote the raising of fish in captivity.
This would also reduce the reliance on capture fisheries production.
More tones of fish would be produced yearly as a result of the rapid growth of the genetically modified fish, and therefore, this would lead to the rapid growth of Aquaculture.
Answer:
I believe the answer is A) Aquaculture will increase more rapidly due to the new fish's rapid growth and economic value.
Explanation:
I hope this helps you! Have a great day:)
how are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism?
Answer:
The correct answer is - they lack a nucleus.
Explanation:
Red blood cells or erythrocytes are anucleated, biconcave, and small specialized cell that produce in bone marrow and lacks the mitochondria at maturity. RBC plays very important role to carry oxygen from lungs to deliver it to the various parts of the body and carry out carbon dioxide from various part to back to the lungs.
Due to lack of the cell organelles and nucleus, these cells are smaller in size. The size of RBC circulate throughout the body through narrow vessels due to its specific size and shape that provide it space for hemoglobin that binds with oxygen.
Thus, the correct answer is - they lack a nucleus.
Answer:
jgjgj
Explanation:
jgjgjjgjjj-
Lasix is a diuretic that blocks the reabsorption of sodium in the ascending loop of Henle. The result of giving this drug would be
Answer:
Reduced extracellular fluids within the kidney, reduced blood pressure.
Explanation:
The loop of henle, which are located within the nephrons in the kidney, have a task of acquiring the water and NaCl from the blood and keeping enough of it in the body so that the homeostasis is maintained.
The result of giving Lasix that reduces the amount of NaCl reabsorption would first of all be "reduced extracellular fluids within the kidney" and it would also change the pH level of the blood and drop blood pressure levels.
I hope this answer helps.
1.) You decide to clean the bathroom. You notice that the shower is covered in a strange green slime. You decide to try to get rid of this slime by adding lemonade juice. You spray half of the shower with lemonade juice and spray the other half of the shower with water. After 3 days of “treatment”, there is no change in the appearance of the green slime on either side of the shower.
Independent Variable:
Dependent Variable:
Control:
Conclusion:
Answer:
The correct answer is :
Independent Variable: side of the shower with lemon juice
Dependent Variable: cleanliness of shower
Control: spray of water
Conclusion: lemonade juice have no effect on slime
Explanation:
Independent variable in any experiment is the variable that is changed or manipulated as here side of the shower that is sprayed with lemonade juice is manipulated to see if there is any effect on the cleanliness of shower.
Dependent variable is the variable that is observed or measured to check if manipulated variable or independent variable have any effect on it, like the cleanliness is measured to check if lemonade juice clean the slime of the side or not.
The control is something that remains the same to check the condition or effect that is not changed or can be compared to it. Water spray is control in this case.
The conclusion of this experiment is that there is no effect of lemonade juice on the cleanliness of slime present in the shower
In any experiment, an independent variable is the variable that is altered or manipulated, such as the side of the shower that is sprayed with lemonade juice to determine if it has any influence just on cleanliness of the shower.
This dependent variable is a variable that can measure Lemonade a manipulated variable or independent variable has any effect on it, such as whether lemonade juice cleans the slime off of the side or not.
A control is something that remains unchanged to assess the condition or impact which has not changed or may be contrasted to it. In the this scenario, the water spray is under command.
The experiment concludes drinking lemonade seems to not influence the cleaning of slime inside the shower.
Each side of the shower with lemon juice is an independent variable.Shower cleanliness is a variable.A water spray can be used to keep things under control.In conclusion, lemonade juice does not affect slime.Learn more:
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Birds belong to different species but share similar characteristics. What inference can be correctly drawn about this statement?
Describe how a lysosome enzyme would normally be created, including the steps involved and the organelles that contribute to the process
Answer:
Lysosomal enzymes are produced in the ER and transported to the Golgi complex to be finally incorporated into acidified vesicles
Explanation:
Lysosomes organelles are generated by the fusion of vesicles from the Golgi complex with endosomes. This organelle contains more than 50 types of hydrolytic enzymes capable of breaking down different macromolecules. Lysosomal enzymes are produced in the endoplasmic reticulum (ER), and then they are exported to the Golgi complex, where mannose-6-phosphate (M6P) label is added to be finally packaged into acidified vesicles. Mutations in the genes that encode for lysosomal enzymes are known to produce Lysosomal Storage Diseases (LSD) including Tay-Sachs disease.
A powerful approach to identifying genes of a developmental pathway is to screen for mutations that suppress or enhance the phenotype of interest. This approach was undertaken to elucidate the genetic pathway controlling C. elegans vulval development. .
Part A
A lin-3 loss-of-function mutant with a vulva-less phenotype was mutagenized. Based on your knowledge of the genetic pathway, what types of mutations will suppress the vulva-less phenotype?
Check all that apply.
A. gain-of-function intracellular signal molecule (LET-60) activated by lin-3 mutants
B. loss-of-function intracellular signal molecule (LET-60) activated by lin-3 mutants
C. loss-of-function lin-3 receptor mutants
D. loss-of-function lin-3 mutants
E. gain-of-function lin-3 receptor mutants
Part B
In a complementary experiment, a gain-of-function let-23 mutant with a multi-vulva phenotype was also mutagenized. What types of mutations will suppress the multi-vulva phenotype?
Check all that apply.
A. gain-of-function intracellular signal molecule (LET-60) activated by lin-3 mutants
B. gain-of-function lin-3 receptor mutants
C. loss-of-function lin-3 receptor mutants
D. loss-of-function intracellular signal molecule (LET-60) activated by lin-3 mutants
Answer:
A. gain-of-function intracellular signal molecule (LET-60) activated by lin-3 mutants
E. gain-of-function lin-3 receptor mutants
Explanation:
Genetic suppressors are widely used in molecular genetics to study gene function in specific developmental stages and target tissues. Suppressing mutations are second mutations triggered at a different site from the mutation of interest in order to suppress the phenotypic effects caused by the first mutation. Caenorhabditis elegans is a model organism to produce genetic suppressors by taking advantage of its rapid generation time and large populations, which enables the application of rapid and powerful mutation screening procedures in the same experiment. In addition, this species reproduces by self-fertilization, thereby both dominant and recessive suppressors can be easily obtained.
Which of the following statements is NOT true of
consumers?
A. They receive their energy indirectly from the
sun.
B. They are also called heterotrophs.
C. They are able to synthesize their own food.
D. They can sometimes eat other consumers.
C)
Explanation:
They are not able to synthesise their own food
The statement that is not true about the consumers is that they are able to synthesize their own food. The correct option is C.
Who is a consumer?In biological terms, a consumer is an organism that consumes other plants and animals to get energy. They are after the producer in the food chain. They are unable to produce their own food.
Except for plants, all other organisms are consumers, they do not have chlorophyll present in their blood, to trap sunlight.
Thus, the correct option is C. They are able to synthesize their own food.
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The organization of the cell and the organisms is maintained through the use of _______. A. Metabolism B. Responsiveness C. Energy D. Synthesis
Answer:
C. Energy
Explanation:
Where should the label for the dependent variable be written for this scatter plot?
Answer:
B. Position B
Explanation:
The values for dependent variable are plotted on the y-axis (vertical) on a scatter plot. Therefore, the label for the dependent variable would be written along the vertical axis for the scatter plot, at position B.
The label for independent variable would be written along the horizontal axis for the scatter plot, at position C.
The answer is "B. Position B"
Lactase is an enzyme that breaks down a sugar found in dairy products known as lactose. Some people are lactose intolerant, and this can be due to not having enough lactase production. People who are lactose intolerant may not feel well after eating foods containing lactose.
identify enzyme:
identify substrate:
Describe the relationship between the substrate and enzyme in the scenario:
Answer:
Identify enzyme: Enzymes are named by adding the suffix -ase to the name of the substrate that they modify or the type of reaction they catalyze(dehydrogenase, decarboxylase)
Identify substrate: the substrate is a molecule upon which an enzyme acts.Enzymes catalyze chemical reactions involving the substrate(s). In the case of a single substrate, the substrate bonds with the enzyme active site, and an enzyme-substrate complex is formed.
Describe: Enzymes bind with chemical reactants called substrates. There may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. In some reactions, a single-reactant substrate is broken down into multiple products. ... The enzyme's active site binds to the substrate.
I hope this helps :)
The enzyme in this case is lactase and the substrate is lactose.
What is the enzyme-substrate relationship?In biochemistry, the molecule on which an enzyme operates is known as the substrate. Enzymes catalyze chemical reactions involving the substrate(s). The substrate is changed by the active site into one or more released products. The active site is then ready to accept a fresh substrate molecule.
To catalyze a reaction, an enzyme will grab (bind) to one or more molecules of the reactant. These substances serve as the enzyme's substrates. In certain reactions, a single substrate can be broken down into a variety of products. Others involve the joining of two substrates to create a larger molecule or the switching of parts. In fact, every biological reaction may probably be sped up by an enzyme.
The fundamental idea should be relatively evident despite slight differences in the definitions of the substrate in general chemistry and biology. A substrate is commonly understood in chemistry as a chemical substance that may be changed by the action of another substance. Without the aid of an external catalyst or enzyme, the transformation takes place in the substrate itself, and in most cases, given enough time, it may happen on its own.
Therefore, lactase is the enzyme and lactose is the substrate.
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igneous rock can easily be identified through their
Answer:
Explanation:
Igneous rocks can be identified by the determination of the composition and texture of the rock.
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why is the chemical formula for disaccharides not two times that of the Monosaccharide.
Answer:
I DO
Explanation:
How do living things differ from nonliving things?
Answer: living things such as “human beings”, “animals”, “plants”, and “microorganisms”.. Nonliving things do no exhibit any characteristics
Explanation: Nonliving things do not grow,respire, need energy, move, reproduce, evolve, or maintain homeostasis. They are made up of non living materials
Answer:
well essentially living things
respire/breathreproduceeat and growwe move, we respond to situations and we feel.
while non-living things
don't breathedon't reproducedon't eat or growand they don't feel or respondexamples of living things are humans, animals, plants and germs
and examples of non-living are plastic, water, buildings etc
Hope this helps (✿◠‿◠)
Glucose enters erythrocytes via a GLUT-1 uniporter. As the levels of glucose in the bloodstream decrease between meals, what happens to the glucose in the cells? A. Glucose leaves the cell through the GLUT-1 uniporter, traveling down the new concentration gradient. B. Glucose remains in the cell because uniporters can only transport in one direction. C. Glucose remains in the cell because the GLUT-1 uniporters are gated and the gates close at low glucose concentrations. D. Glucose remains in the cell because it has been phosphorylated and no longer has affinity forthe GLUT-1 uniporter.
Answer:
A. Glucose leaves the cell through the GLUT-1 uniporter, traveling down the new concentration gradient.
Explanation:
The Glucose transporter 1 (GLUT1) protein is a critical uniporter transporter that facilitates the movement of glucose molecules across the plasma membrane. The expression of GLUT1 is increased when glucose concentration is reduced and, inversely, GLUT1 expression is reduced when glucose levels are increased. The erythrocytes are cells that continuously require the supply of glucose from the blood plasma, this mechanism involves the function of GLUT1 that permits the energy-free passage of glucose by diffusion.
The absorptive effectiveness of the small intestine is enhanced by increasing the surface area of the mucosal lining. Which of the following accomplish this task?
a. the rugae and haustra
b. plicae circulares, villi, and microvilli
c. the vast array of digestive enzymes
d. Brunner's glands and Peyer Patches
Answer:
Option B
The plicae circulares, villi, and microvilli
Explanation:
The plicae circulares are the folds of mucous membrane on the inside of the small intestine. They are covered with tiny hair-like structures called the villi, and microvilli. The purpose of those folds is to increase the surface area for the absorption of food nutrients to take place in the small intestine before the food finally moves on to the large intestine for excretion.
The tiny hair-like projections (villi, and microvilli) further increase the surface area available for nutrient absorption by providing extra surfaces in which the nutrients can diffuse into the small intestine through.
This makes option B correct.
Sodium and potassium ion channels have several negatively charged residues at the entry to the channel. Identify the bases on which K channels specifically select for K ions, in other words, why do K channels not enable Na ions to cross the membrane
Answer:
Mechanism in attachment.
Explanation:
K⁺ channels have narrow pores, which prevents the passage of larger ions. However, since Na⁺ has an ionic radius smaller than K⁺, this does not explain the selective permeability of these channels towards K⁺.
In this case, the channel pore has a narrow selective filter which is delimited by the backbone carbonyl oxygens (C=O). When a K⁺ ion enters in the selection filter it interacts with these oxygens, and the molecules of water bound to K⁺ are displaced, which allows the passage of the dehydrated ion K⁺ through the pore. However, a dehydrated Na⁺ is too small to interact with these carbonyl oxygens in the selective filter, which stays open. As a consequence, the Na⁺ ion remains bonded to the water molecules in a hydrated complex that is too big to pass through the channel.
What is the importance of blood group systems?? Please help ASAP
Answer:
The accurate grouping of blood is very important because when it comes to blood donation .if a blood is given to a patient that has a blood incompatible with the blood type of the blood that the patient receives, it can cause intravenous clumping in patients blood which can be fatal.
hope this helps you :)
Explanation:
Answer:
The ABO classification is the most important and relevant for blood compatibility. A small number of antigens and antibodies are responsible for the ABO blood types. The specific combination of these components determines an individual's type in most case
Explanation:
PLEASE HELP ME!!!! This figure shows two alleles for the beta-globin gene. The A allele is the most common allele. The S allele is responsible for Sickle Cell Disease. The R group glutamic acid is negatively charged, while the R group of valine is hydrophobic. What molecular change, ultimately resulting in the sickle cell phenotype, occurs when valine in substituted in place of glutamic acid at position 6 in the β subunit of hemoglobin?
Answer:
The correct answer is option B. The tertiary structure of the beta subunit changes, exposing a hydrophobic cleft which allows hemoglobin to form long chains in RBC.
Explanation:
As it is clearly mention as there is point mutation that leads to single nucleotide change which results in to valine instead of glutamate. Valine is hydrophobic in nature not like glutamate. Valine aggregate and makes a rigid structure of molecules.
Due to this rigid molecule of valine aggregates, RBCs form a crescent or sickle like shape due to the higher viscosity and low solubility of Mutated hemoglobin in deoxy condition. It leads to formation of polymer that blocks the vessels.
Thus, the correct answer is option B.
two scientists do not agree on which type of grocery ba is better for the environment
Answer:
The most likely outcome of their disagreement is the use of cloth tote bags.
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What are two basic differences between DNA and RNA? RNA is usually single stranded, while DNA is usually double stranded. RNA contains uracil, while DNA contains thymine. RNA is usually double stranded, while DNA is usually single stranded. RNA contains thymine, while DNA contains uracil. RNA doesn’t contain cytosine, while DNA doesn’t contain adenine.
Answer:
Explanation
the two basic difference between RNA and DNA are
RNA is single stranded while DNA is double stranded
RNA contain uracil and DNA contain thymine
Answer: I just took the test
Explanation:
Here's the picture
Earth's Greatest Enemies?Climatologist James Lovelock(originator of theGaia_hypothesis ) once said that Earth's greatest enemies were cars, cows and chainsaws because of their contributions to destabilizing planetary climate.1. How do each of these things (cars, cows, andchainsaws) contribute to the destabilizing of Earth's atmosphere and climate? You must cite specificevidence from any Unit of the course to support your response. And...2. How are these three things connected to one another either by cause, effect or by solution. Consider all of the environmental concerns you have been learning about during the entire course and describe how these 3Cs as a group relate to one specific environmental issue (other than atmospheric destabilization).Reminder: Loss of land plants will not result in a reduction of atmospheric oxygen (because most of planetary photosynthesis and its resulting oxygen production is in the oceans).
Cars, cows and chainsaws are major polluters and their use must be regulated and limited, to reduce the emission of polluting gases into the atmosphere that can cause drastic climatic changes that harm the environment that we know intensely.
Although it is not widely publicized in the media and few people know about it, the chainsaw is a great villain of the earth's atmosphere, since its use releases large amounts of CO2 into the atmosphere, due to the burning of gasoline that these machines make to work. CO2, in addition to endangering the operator's life, is a gas that destroys the ozone layer and increases the effect of global warming. Not only does the chainsaw release this gas, but so do cars, which reinforces the need to use renewable fuels to be used in both cases.
Cows also release polluting gas, methane, which has a greater polluting potential than CO2. Methane is the result of the cow's digestive reactions, which release this gas into the atmosphere steadily. As herds of cows tend to be large, livestock becomes a major polluter, as herds result in a strong release of methane into the environment. This reinforces the need for increasingly stronger regulations for livestock, in addition to highlighting the importance of adopting alternative methods of feeding that reduce meat intake.
Rita was all ears when Lee told her the secret. Lee knew that Rita would not spill the beans. Rita has always been a true friend and has a heart of gold. What did it mean by Rita was all ears?
Answer: Hi!
When the text says Rita was all ears, it meant that Rita was listening very closely to Lee and giving him all of her attention while he was talking.
Hope this helps!
If you have a density of 100 kg/L, and a mass of 1000 units, what are the mass units? and what is the volume?
Answer: Volume is 10
Explanation: v=m/p
= 1000 kilogram/100kilogram/cubic meter
= 10 cubic meter
Answer:
Volume is 10
Explanation:
A falling blood pH and a rising partial pressure of carbon dioxide due to pneumonia or emphysema indicates ________.
A) respiratory acidosis
B) metabolic acidosis
C) respiratory alkalosis
D) metabolic alkalosis
A. respiratory acidosis
Blood analysis indicates a low pH, and the patient is breathing rapidly.
A decrease in blood pH and an increase in carbon dioxide partial pressure due to pneumonia or emphysema signifies respiratory acidosis. The correct option is A.
What is respiratory acidosis?Respiratory acidosis arises when the lungs are unable to eliminate all of the carbon dioxide made by the body. This induces body fluids, notably blood, to become overly acidic.
A decrease in blood pH and an increase in carbon dioxide partial pressure due to pneumonia or emphysema signifies respiratory acidosis.
Thus, the correct option is A.
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