Nerve impulses travel along the neurons by the opening of channels that allow sodium ions to flow inward, followed by an outward flow of potassium ions. In order to ensure that the impulse may be produced at any time, sodium is actively transported out of the cell, and potassium is transported into the cell by the sodium/potassium pump. Which of the following types of work is performed by the
sodium/potassium pump?
A) mechanical
B) electrical
C) concentration
D) synthetic
E) bioluminescent
C) concentration
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____________________ involves the fertilization of the egg outside the body, followed by transfer of the embryo into a woman's uterus
Fill in the blank(s) with correct word
A male with a missing SRY gene would be phenotypically a
A) female. B) male. C) a female until age 12, and then a male. D) a male until age 12, and then a female.
Which of the following is a fungus that commonly lives in the large intestine?
A) Bacteroides B) Escherichia C) Campylobacter D) Candida E) Lactobacillus
You are working in a biotech company that has discovered a small-molecule drug called H5434. H5434 binds to LDL receptors when they are bound to cholesterol. H5434 binding does not alter the conformation of the LDL receptor's intracellular domain
Interestingly, in vitro experiments demonstrate that addition of H5434 increases the affinity of LDL for cholesterol and prevents cholesterol from dissociating from the LDL receptor even in acidic conditions. Which of the following is a reasonable prediction of what may happen when you add H5434 to cells? (a) Cytosolic cholesterol levels will remain unchanged relative to normal cells. (b) Cytosolic cholesterol levels will decrease relative to normal cells. (c) The LDL receptor will remain on the plasma membrane. (d) The uncoating of vesicles will not occur.