You are a breeder of animals with an X-linked coat-color gene, one allele of which gives black fur and another of which gives white fur
If you cross a black-colored female with a white-colored male, what would their male and female offspring look like?
Their male offspring would be all black, while their female offspring would be mottled, owing to X-inactivation:
XbXb × XwY → males: XbY (black)
females: XbXw (some fur patches black, some white)
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Membrane proteins serve many functions. One of the functions is transportation of substances across the membrane. If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins, the process that will be affected is
A. active transport. B. osmosis. C. simple diffusion. D. phagocytosis. E. pinocytosis.
Histamine ____
a. causes blood vessels to contract b. causes capillaries to lose their permeability c. causes an outward flow of fluids from the capillaries d. reduces tissue swelling e. causes cells to release interferons
It is considered healthy to have high levels of high-density lipoproteins (HDL). Why is this true?
A) HDL is a form of saturated fat. B) HDL moves cholesterol to the liver for disposal. C) HDL moves cholesterol to the heart. D) HDL is important in making complete proteins.
A more or less circular ring of mushrooms appears in your yard, apparently overnight. The circle is several yards in diameter. The most likely explanation for this circle of mushrooms is that:
A) the mushrooms are all part of the same organism, with mycelia radiating out from the location of a germinated spore. B) a circle is nature's most perfect shape for asexual reproduction structures. C) the fungus produces a toxin in the center to prevent too many mushrooms from being produced. D) one mushroom in the circle reproduced sexually to make all the other mushrooms in the circle.