The lac repressor is not encoded by the mutated I gene in the operon, which could be a possible explanation for this occurrence.
There are a number of possible causes for a specific E. coli cell's ongoing breakdown of lactose into glucose and galactose, including:
1. The lac operon is activated: The expression of genes involved in the breakdown of lactose is controlled by the genetic regulatory system known as the lac operon. The breakdown of lactose into glucose and galactose occurs when the lac operon is induced and the genes involved in lactose metabolism are expressed when lactose is present.
2. Expression of the lac operon in its basic form: The lac operon may be constitutively expressed in some instances, meaning that it is always active regardless of whether lactose is present. This could be the result of a mutation in the repressor protein, which normally regulates the expression of the operon or a mutation in the regulatory regions of the operon.
3. Lactose insufficiency: There will always be lactose for the E. coli cell to break down if it is growing in a high lactose environment. As a result, the breakdown of lactose into glucose and galactose can continue at a high rate.
4. Repression of the lac operon that is ineffective: When lactose is not present, the repressor protein that normally controls the expression of the lac operon may not be able to effectively turn off the operon if it is not functioning properly. The continuous breakdown of lactose into glucose and galactose as a result of this can be caused by the continuous expression of genes involved in lactose metabolism.
It is essential to keep in mind that the specific circumstances and genetic background of the cell would determine the specific explanation for the ongoing breakdown of lactose in this particular E. coli cell. To pinpoint the exact cause, additional research, such as genetic analysis, would be required.
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Where are arterial anastomoses, in which two arteries merge, found?
a. In the coronary circulation b. In the fingers, palms, toes, and ears c. Connecting the hypothalamus and anterior pituitary d. Connecting the intestines to the liver
The arterial anastomoses, where the two arteries merge are found: (a)In the coronary circulation.
Arterial anastomoses are the connections between two arteries. These connections are established for better circulation of blood. These connections may occur naturally in order to forms an alternative pathway for the flow of blood.
Coronary circulation is the blood circulation mediated to the heart. It is comprised of the heart and the coronary arteries that are wrapped around the outer side of the heart. The coronary circulation ensures that the oxygen-rich blood is supplied to the heart as well. The major coronary arteries are: right coronary artery, left main coronary, left anterior descending, and left circumflex artery.
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you want to perform a colony counting experiment. what would likely happen if you plated undiluted bacteria culture onto a plate?
The colonies would be too close for counting if you plated undiluted bacteria culture onto a plate.
In order to make the bacterial colonies countable a series of serial dilutions is performed to create decreasing concentrations of the original sample. these dilutions are then are then plated for making the plate countable with a low but enough number of bacteria that can be easily counted in the individual colonies.
Hence , diluting the sample, is necessary to plate different concentrations of the sample and to obtain an bacterial plate with an easily countable number of bacterial colonies .
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Genetic crosses involving a particular type of flower exhibit complete dominance with respect to petal color. Red(R) is dominant to white(r).
Using the punnet square, what is the expected percentage of offspring that will have white flowers from a cross of parent flowers with a genotype of Rr.
Petal color is completely dominant in genetic crosses with a certain variety of flower. White (r) has a 25% dominance over red (R). B is all crimson Genetic crosses.
How does genetics work?Pay attention to how it sounds. the research of genes and inheritance. Heredity is the transmission of genetic traits and features from one generation to the next, including eye color and a greater propensity to catch a certain disease.
Does inherited imply genetic?Hereditary disorders have the ability to be passed down from one person to the next, whereas genetic disorders can either be familial or otherwise, but there is always some gene mutations change in the chromosome. This is the major distinction between the two concepts.
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though science fiction hsa produced stories like the blob, we do not see many large, single celled organism. which is a reason for limitation to cell size
The rates of protein production, the folding speeds of its slowest proteins, and—for big cells—the rates of protein diffusion all serve as growth constraints on cells.
What are the constraints of cell size measurement?The surface-area-to-volume ratio of cells prevents cells from growing to an extent that their surface area is insufficient to absorb nutrients and expel waste.
Prokaryotic cells do not fit the criteria for the cell hypothesis since they lack a distinct nucleus. Every known living thing is made up of one or more cells. All living cells grow from pre-existing cells through division. The cell is the fundamental structural and functional unit in all living things.
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What does complex animals mean in biology
Answer:In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear.
write the number of chromosomes and amount of dna ( ng ) present per cell at the end of telophase i of meiosis (after cytokinesis).
The two new groups of chromosomes are surrounded by membranes in the concluding phase, called telophase, and the mitotic spindles that gave these groups their strength are broken down.
The cell has two 46-chromosome groups when mitosis is finished, each encased in its own nuclear membrane. There are 23 chromosomes at the telophase-II stage and 46 chromosomes in the human genome. The stage of telophase-II is when the nuclear envelope surrounds the collection of chromosomes at each spindle pole. Each cell will have 10 unreplicated chromosomes, the same number as the progenitor cell. There is only one DNA molecule per unreplicated chromosome. Therefore, each cell will contain 10 DNA molecules at the conclusion of telophase/cytokinesis.
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If Freed’s theory is confirmed, how might it be helpful outside of the New Madrid area?
If Freed's hypothesis is true, then there might be further flaws waiting in the wings to explode. The Midwest has been shaken by large earthquakes on various occasions throughout history.
Why would there be a higher danger of earthquakes in the New Madrid region?If more ancient organism are released, more earthquakes may occur in the New Madrid region. Other places might be experiencing similar trends. We are aware of numerous rifts beneath different river valleys across the nation, he claims. Many of the locations haven't recently been subject to earthquakes.
How will the Novo Madrid Fault affect things?Travel across southwest Missouri would be rendered impossible as thousands of bridges could crumble and railways will be wrecked. The state would sustain damages totaling close to $40 billion.
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a scientist claims that an individual could carry the allele for huntington's disease, yet show none of its symptoms. which feature of huntington's disease supports this claim?
Feature of Huntington's disease that supports the claim is presence of One gamete that is formed abnormally as the pair of homologous chromosomes are not separated properly .
Huntington's disease occurred due to a single dominant allele. This is a lethal disease, but this is found commonly in the human population. Huntington's disease represents its symptoms during the course in midlife, when people with this disease already had their offspring.
Huntington's disease is generated by a mutation in the gene for a protein called huntingtin. This mutation also causes defect in the building blocks of DNA called cytosine, adenine, and guanine (CAG) and they are repeated many number of times than they normally occurs.
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How do rainforest ecosystems differ from other forest ecosystems?
They have less biodiversity and less light that reaches the forest floor than other forest ecosystems.
They receive more rainfall and have warmer average temperatures than other forest ecosystems.
They have warmer average summers and milder average winters than other forest ecosystems.
They have more limited areas along coastal areas than other forest ecosystems.
an mutations in somatic cells be passed onto offspring?
Answer: No
Explanation: Somatic mutations are a change to a person's DNA that occurs after conception to any cell that isn't a germ cell (egg or sperm). You can't inherit somatic mutations because they occur randomly in cells that aren't sperm or egg cells (germline mutations).
scientists compared fossil remains of a species that lived 5,000 years ago with members of the same species living today. scientists concluded that this species had changed very little over the entire time period. which statement best accounts for this lack of change? *
The most likely explanation for a lack of change in a species over a 5,000-year time period is that the species is well-adapted to its environment and experiences little pressure to evolve.
Evolution by natural selection occurs when certain traits that are advantageous in a particular environment become more common in a population over time. If a species is well-adapted to its environment, it may not experience much pressure to evolve, as the traits that are advantageous in its environment are already common in the population.
In this case, the species in question has likely been able to survive and reproduce effectively for thousands of years without undergoing significant changes, as it is well-adapted to its environment.
If a species experiences no significant environmental changes over a long period of time, it may not experience pressure to evolve and may remain relatively unchanged.
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The average annual rainfall in Florida is 55 inches. Is this an example of weather or climate
Answer:
Weather
Explanation:
The difference between weather and climate is a measure of time. Weather is what conditions of the atmosphere are over a short period of time, and climate is how the atmosphere "behaves" over relatively long periods of time.
When we talk about climate change, we talk about changes in long-term averages of daily weather. Today, children always hear stories from their parents and grandparents about how snow was always piled up to their waists as they trudged off to school. Children today in most areas of the country haven't experienced those kinds of dreadful snow-packed winters, except for the Northeastern U.S. in January 2005. The change in recent winter snows indicate that the climate has changed since their parents were young.
If summers seem hotter lately, then the recent climate may have changed. In various parts of the world, some people have even noticed that springtime comes earlier now than it did 30 years ago. An earlier springtime is indicative of a possible change in the climate.
In addition to long-term climate change, there are shorter term climate variations. This so-called climate variability can be represented by periodic or intermittent changes related to El Niño, La Niña, volcanic eruptions, or other changes in the Earth system
proteins are polymers formed of structural units calledgroup of answer choicesphosphate groups.nucleic acids.amino acids.fatty acids.
Proteins are polymers formed of structural units called c)amino acids.So,correct option is c.
Proteins are polymers, meaning they are enormous particles comprised of numerous more modest atoms. The little particles that make up proteins are called amino acids.Every amino corrosive contains a carbon particle, an amino gathering, a carboxyl gathering, and a side chain (otherwise called a R bunch).
The side chain is the main variable part of the amino corrosive. The kind of side chain distinguishes the sort of amino corrosive and furthermore decides its qualities (for example its size, pH, and extremity). There are around 20 distinct kinds of amino corrosive in the human body, however these can join to make roughly 20,000 extraordinary proteins.
Amino acids are consolidated by peptide bonds, which structure between the amino gathering of one particle and the carboxyl gathering of another. Two amino acids combined is known as a dipeptide; a chain made of different amino acids is known as a polypeptide.
Hence,correct option is c.
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(Complete question) is:
proteins are polymers formed of structural units calledgroup of answer choices
a)phosphate groups.
b)nucleic acids.
c)amino acids.
d)fatty acids.
Some vitamins act as ___________, helping to preserve the health of cells.
Some vitamins act as antioxidants, helping to preserve the health of cells.
Vitamins are organic nutrients needed by the body because they are not synthesized by the body and function as biochemicals. Vitamins can be obtained from fruits, vegetables or supplements. When a person is deficient in vitamin intake, he can experience, for example, thrush due to a lack of vitamin C.
Antioxidants are natural or man-made substances that can prevent or delay certain types of cell damage due to the oxidation process. Some of the vitamins that act as antioxidants are vitamins A, C, E, folic acid, and beta carotene, each of which has its own benefits. Vitamins can act as antioxidants because vitamins can be oxidized so that they can protect other compounds from oxidation.
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A scientist is attempting to date the age of a chosen rock layer. Which of the following is NOT necessary for being able to determine the age using radiometric dating?
a. The half-life of the daughter isotope
b. The half-life of the radioactive isotope
c. The identity and relative abundance of the daughter isotope
d. The relative abundance of radioactive isotope present in the sample
The statement which is not necessary for being able to determine the age using radiometric dating is the half-life of the daughter isotope. Thus, the correct option for this question is A.
What is Radiometric dating?Radiometric dating may be defined as a type of methodology that significantly calculates the age of geological material like rocks in years by measuring the presence of a short-life radioactive element.
The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample. Radioactive isotopes break down in a predictable amount of time, enabling geologists to determine the age of a sample using equipment like this thermal ionization mass spectrometer.
Therefore, the statement which is not necessary for being able to determine the age using radiometric dating is the half-life of the daughter isotope. Thus, the correct option for this question is A.
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which of the answer choices accurately describes one way the human x and y chromosomes differ from one another?
The X and Y chromosomes differ in size and function, with the X chromosome containing 1,500 genes and the Y chromosome containing 100. Both contain both autosomal and X-linked genes, while the Y chromosome contains only Y-linked genes.
What is the difference between X and Y chromosomes?The size of the human X and Y chromosomes is different from one another. With over 1,500 genes compared to the Y chromosome's 100, the X chromosome is significantly bigger than the Y chromosome. Many activities, including the control of gene expression, cell growth and development, reproduction, and several metabolic processes, are controlled by the X chromosome. On the other hand, the Y chromosome is principally in charge of defining male sex traits. Together with other genes involved in male fertility and typical male development, it also contains the gene that turns on the production of testosterone and other male hormones. Moreover, distinct kinds of genetic material make up the X and Y chromosomes. Both the autosomal and X chromosomes and X-linked gene, while the Y chromosome contains only Y-linked genes.
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The complete question is: What is one way the human X and Y chromosomes differ from one another?
the primary purpose of mitosis is to . multiple choice question. ensure proper replication of the genetic material during the s phase of the cell cycle enhance the genetic diversity of a species via crossing-over between chromosomes distribute the replicated chromosomes equally into the two daughter cells
The primary purpose of mitosis is to distribute the replicated chromosomes equally into the two daughter cells.
Mitosis is a process of cell division that allows for the equal distribution of genetic material to each daughter cell. During this process, the chromosomes in the cell's nucleus are duplicated and then separated, with each daughter cell receiving a complete and identical set of chromosomes. This ensures that the genetic information is accurately and equally passed on to the next generation of cells.
While the replication of the genetic material during the S phase of the cell cycle is important for the proper functioning of mitosis, it is not the primary purpose of the process. Similarly, while genetic diversity can be enhanced via crossing-over between chromosomes, this occurs during meiosis, not mitosis.
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Which of the following is true about the de novo synthesis of nucleotides?
A. Deoxyribonucleotides are precursors of ribonucleotides. B. Pyrimidines are precursors of
purines.
C. Purines are synthesized then
attached to ribose or
deoxyribose.
D. Amino acids are precursors of nucleotides.
The de novo synthesis of nucleotides is a complex process that involves the synthesis of purine and pyrimidine nucleotides separately and their subsequent combination with ribose or deoxyribose to form the final nucleotides. Therefore, option C is the correct statement about de novo synthesis of nucleotides.
Nucleotides are the building blocks of DNA and RNA, which are essential for genetic information storage and transmission. De novo synthesis of nucleotides refers to the process of synthesizing nucleotides from simple precursor molecules rather than using pre-existing nucleotides. In this process, purine and pyrimidine nucleotides are synthesized separately and then joined together to form nucleotides.
The correct statement about de novo synthesis of nucleotides is option C - purines are synthesized and then attached to ribose or deoxyribose. Purines are synthesized from small molecules like amino acids, carbon dioxide, and formate, in a complex process involving multiple enzymatic steps. The final product, inosine monophosphate (IMP), is then converted to AMP and GMP, the two purine nucleotides. These nucleotides are then combined with ribose or deoxyribose to form the final purine nucleotides, adenosine and guanosine.
On the other hand, pyrimidines are synthesized from smaller molecules like aspartate, carbamoyl phosphate, and bicarbonate. The end product of pyrimidine synthesis is uridine monophosphate (UMP), which is then converted to the other pyrimidine nucleotides, cytidine and thymidine.
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from superior to inferior, what are the 3 midline arteries coming off the abdominal aorta that supply the abdominal organs?
From superior to inferior, the three midline arteries that come off the abdominal aorta and supply the abdominal organs are: Celiac trunk, Superior mesenteric artery and Inferior mesenteric artery.
The celiac trunk is the first branch of the abdominal aorta and supplies the foregut, including the stomach, duodenum, liver, pancreas, and spleen. The superior mesenteric artery supplies the midgut, including the jejunum, ileum, cecum, appendix, and part of the colon.
The inferior mesenteric artery supplies the hindgut, including the remaining part of the colon, rectum, and anus. These three arteries play a critical role in providing blood flow and nutrients to the various abdominal organs, and any disruption to blood flow through these arteries can result in serious health problems.
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Step 7: Determine the Sizes of the Flocks in the Third Generation
The size of the third generation flocks can be obtained by data collection and analysis.
How do you determine the Sizes of the Flocks in the Third Generation?The size of the flocks in the third generation can be determined by collecting data and analyzing it. Here are some steps that could be followed to determine the size of the flocks:
Count the number of individuals in each flock: This can be done by visually observing the flocks and counting the number of individuals in each one.
Record the data: Write down the number of individuals in each flock in a table or spreadsheet.
Analyze the data: Once the data has been recorded, it can be analyzed to determine the size of the flocks in the third generation. This could involve calculating the mean, median, mode, and range of the data, as well as creating graphs or charts to visualize the data.
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three criteria used for classification of the atmosphere are question 73 options: structure, origin, evolution. composition, origin, evolution. structure, origin, temperature. composition, temperature, and function.
b. Composition, temperature and function. Through insulation from incoming ultraviolet (UV) radiation, protection from extremes in daytime and nighttime temperatures, and protection from incoming UV radiation.
The atmosphere safeguards life on earth. The convection that results from the sun's heating of the atmosphere's layers, which drives air flow and weather patterns all across the planet. Nitrogen, oxygen, and argon are the three main gases that make up the Earth's atmosphere. About 0.25% of the mass of the atmosphere is made up of water vapour. As the Earth cooled, gases emitted by volcanoes mostly made up the atmosphere. It had up to 200 times as much carbon dioxide as the atmosphere we have today, along with methane, hydrogen sulphide, and hydrogen. the earth's axis is rotating.
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Three criteria used for classification of the atmosphere explained in the text are A) composition, origin, evolution. B) composition, temperature, and function. C) structure, origin, temperature. D) structure, origin, evolution.
disturbance of archaeological record from plant/animal activities such as root growth or animal digging are called:
Disturbances of the archaeological record caused by plant or animal activities such as root growth or animal digging are called bioturbation.
Bioturbation refers to the physical and chemical changes to soil, sediment, and other materials brought about by the activities of living organisms. This process can mix, reorder, and destroy archaeological deposits, making it difficult for archaeologists to interpret the original depositional environment and cultural context of the site.
Examples of bioturbation include root growth, which can penetrate and break apart archaeological deposits and alter the distribution of artefacts and ecofacts.
Animal digging, such as the creation of burrows or nests, can mix and reorder soil layers and cause the loss or displacement of artifacts.
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What characteristics do the lamprey and tuna have in common
Fish species like lamprey and tuna may be found in enormous bodies of water like rivers and seas.
Due to their high levels of migration, they both traverse large distances in search of food and spawning opportunities. They can swim quickly across the water thanks to their comparable elongated and streamlined body shapes.
They can also draw oxygen from the water through their gills and have a highly developed sense of smell. They both consume smaller fish, crabs, and other aquatic creatures as food.
The last method of reproduction for both species is external fertilization, in which the eggs and sperm are dispersed into the sea.
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How would pet owners do if there was no pets
Pet owners, especially dog owners who walk their dogs, are frequently more physically active and healthier. Had more ordered daily routines, better mental health, and a higher likelihood of discovering new interests.
What is a pet owner referred to as?But it appears that more pet owners are referring to each other as parents or guardians. The word "owner" for pets has been replaced with the term "guardian" in several places. But this would alter a lot of elements of pet ownership. Additionally, it can deny pet owners some rights.
Do pet owners count as parents?Point One: Those of us who refer to ourselves as the "caregivers" of animals are not joking around. They sincerely believe that what they are doing qualifies as parenting.
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what is the difference between a diploma and a bachelors degree
The main distinction between diploma and degree programmes is that a degree can be pursued following the completion of the higher secondary examination (10+2), whereas a diploma can be obtained following high school (10th Std.).
What is the difference between a diploma and a bachelor's degree?
Diplomas: Provide an exit point so you can earn a qualification more quickly.
Degrees: Earning a bachelor's degree will take you three years to complete.
Diplomas: More hands-on, experiential learning that is more practical.
Degrees: More academic
Is a diploma greater than Bachelor?
The Diploma of Higher Education is a higher education diploma that is equal to the second year of a bachelor's degree. A vocational credential at the same level is the Higher National Diploma.
Which is a better diploma or a degree?
A degree programme will give you comprehensive knowledge and skills in your chosen field, making you more marketable and desirable for jobs paying more. A degree programme may be costly and time-consuming, which is a drawback.
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What is the relationship between the levels of COz in the atmosphere and the levels of CO2 in an ocean's ecosystem?
When the level of carbon dioxide increases in the atmosphere, the level of CO2 also increases in the oceanic ecosystem due to absorption.
What is an Ecosystem?An ecosystem may be characterized as a place or an area where individuals of different species live together and interact with one another for the purpose of food, shelter, space, and mating partner.
An ecosystem of the ocean absorbs about 30% of the carbon dioxide that is released into the atmosphere. As levels of atmospheric CO2 increase from human activity such as burning fossil fuels (e.g., car emissions) and changing land use (e.g., deforestation), the amount of carbon dioxide absorbed by the ocean also increases.
Therefore, the amount of carbon dioxide in the atmosphere is directly related to the amount of carbon dioxide in the ocean.
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the sugars associated with glycoproteins and glycolipids of animal cell membranes is?
The sugars associated with glycoproteins and glycolipids of animal cell membranes is function as indicators to separate one cell from another.
What is cell membrane function?Every cell has a cell membrane, often referred to as a cellular membranes, that separates the interior of the cell from the outside world. The cell membrane is a lipid bilayer that is semipermeable. The cell membrane regulates the flow of substances through and through the cell.
Who created the cell membrane?A cell membrane, sometimes referred to as the plasma membrane, is the thin membrane that surrounds every live cell. Fatty acids are the primary building blocks of the lipids and different proteins cell membranes. Based on the characteristics of lipids, biological membranes develop, and all cell membranes have the same internal structure: bilayers of phospholipid bilayer with accompanying proteins.
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are the genes that cause vestigial wings and the quiver phenotype linked? do a chi-square test of independence to determine whether the genes have assorted independently.
If the percentage of recombinants in a cross between a homozygous and heterozygous test is less than 50%, the genes are said to be linked. Both genes are linked in the above scenario.
The ratio of phenotypes would be 1:1:1:1 for independent assortment.
Observed Expected O-E (O-E)²
230 162.5 67.5 4556.25
224 162.5 61.5 3782.25
97 162.5 -65.5 4290.25
99 162.5 -63.5 4032.25
The chi-square value is 102.5, which is completely outside the range, and the degrees of freedom are 4-1 = 3. The hypothesis is thrown out. The genes do not assort independently.
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(complete question)
are the genes that cause vestigial wings and the quiver phenotype linked? do a chi-square test of independence to determine whether the genes have assorted independently.
vg+ sps+ 230
vg sps 230
vg sps+ 230
vg+ sps 230
total 650
if 1 kilometer= 0.62mile, how many miles are in 50 kilometers?
Answer:
0.62 x 50 = 31 miles
the bacteria and archaea include microscopic prokaryotes that lack membrane-bound nuclei. what criteria have lead to the classification of these two groups as separate domains? select all that apply.
Different types of DNA and RNA polymerases have led to the classification of these two groups as separate domains.
Prokaryotes are small single-celled organisms that lack specialized organelles and a defined nucleus with a membrane. Bacteria and archaea are prokaryotes.
It appears that prokaryote life began about over 4 billion years ago, surviving on the atmosphere's early levels of carbon dioxide, carbon monoxide, steam, nitrogen, hydrogen, and ammonia.
Archaea and bacteria are the two domains that makeup prokaryotes. Prokaryotes do not have distinct cellular compartments; rather, all of the internal water-soluble components, including proteins, DNA, and metabolites, are found together in the cytoplasm, which is surrounded by the cell membrane. The protein-based bacterial micro-compartments that bacteria have been hypothesized to function as early organelles encased in protein shells. Large colonies of some prokaryotes, including cyanobacteria, are possible. Some have multicellular stages in their life cycles, such as myxobacteria.
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