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In the human body, the potassium ion can pass easily through cell membranes, yet the potassium ion concentration is higher inside many cells than it is outside these cells. Could this be accomplished by passive diffusion? Explain your answer.
Assume ou have been hired the task of studying the ecology of an isolated population of a rare tropical turtle, to assess its long-term prospects for survival.
Describe the care that Sue received. Why did not the nurses who took care of her put themselves in her position and take better care of her?
A typical bacterial flagellum is about 20 nm wide. About how many times must the diameter of the flagellum be increased to make visible using a bright field microscope?
Many groups are using modified RNA with 2'-deoxy-2'-fluoro substitutions for riboses (i.e. a 2'-fluorine instead of a 2'-OH) to prevent RNA cleavage by ribonucleases.
If a double heterozygous plant were crossed with a plant that has green stems and red fruit, what offspring phenotypes would be expected and in what proportions.
Describe the role of each of the four layers in the stomach including the mucus cells and parietal cells of the mucosa layer.
In Drosophila, the eye-color mutation scarlet (st) and the bristle mutation spineless (ss) are located in chromosome 3 at a distance of 14 map units. What phenotypes, and in what proportions, would you expect in the progeny from the mating of st+ ..
Verify the listed specific committed effective dose-equivalent, HE per unit intake, is 8.63 E-9 Sv/Bq. Find the most limiting ALI.
If the ATP synthase molecules were randomly orientated so that about half faced the outside of the vesicle and half faced the inside, would you expect ATP to be synthesized.
Create a point mutation in the gene that will result in a genotype change, but not a phenotype change. Circle the point mutation on the DNA strand and name an agent that causes point mutations.
Some of the Drosophila you are working with have miniature wings. Suppose you perform the following three crosses to determine the heritance of the miniature wing phenotype.
If an organism's DNA contains 16% thymine nucleotides, what percentage of its DNA is composed of guanine nucleotides? Is the answer 34%?
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