Alkylating agents work to prevent the cell from replicating its genetic material, thus preventing cell division. At which checkpoint would the cell most likely stop?
A. M checkpoint
B. S checkpoint
C. G1Â checkpoint
D. G2Â checkpoint
Answer: D
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Some bacteria in the human intestine aid in the digestion and absorption of nutrients, while utilizing these nutrients themselves as well. This is an example of:
A. commensalism. B. mutualism. C. parasitism. D. predation. E. an antagonistic interaction.
In humans, the gonads do all of the following
a. produce gametes. b. secrete hormones. c. nourish the embryo. d. produce gametes and secrete hormones. e. produce gametes, secrete hormones, and nourish the embryo.
If the frequency of hemophilia, an X-linked recessive disease, is 10% in males, what is the frequency of carriers in the population (both males and females)?
What will be an ideal response?
When the neurotransmitter acetylcholine is applied to skeletal muscle cells, it binds the acetylcholine receptor and causes the muscle cells to contract
Succinylcholine, which is a chemical analog of acetylcholine, binds to the acetylcholine receptor on skeletal muscle cells but causes the muscle cells to relax; it is therefore often used by surgeons as a muscle relaxant. Propose a model for why succinylcholine causes muscle relaxation. What might be the mechanism to explain the different activities of acetylcholine and succinylcholine on the acetylcholine receptor?