Which of the following best describes the effect of cancer-causing mutations on the cell cycle?
A. The mutations increase the speed of the cycle.
B. The mutations cause the cell to bypass checkpoints in the cycle.
C. The mutations eliminate one or more stages of the cycle.
D. The mutations interfere with S stage of the cycle.
E. None of these.
B
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What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They associate with a protein bound to GDP or GTP. B. They are all linked to protein kinase activation. C. They change their conformation when bound to a hormone. D. They open ion channels. E. They bind similar hormones.
Positive assortative mating in a population will:a
produces more mutations each generation. b. causes natural selection. c. changes allele frequencies. d. stabilizes genotype frequencies. e. increases homozygosity.
Which of the following is likely to lead to a clumped population distribution?
A. population of animals dependent on rare resources. B. Small populations of widely dispersed plants. C. Large populations of widely dispersed plants. D. None of the above is correct.
Select two classes of HIV drugs, and fully explain how they work. Can they cure HIV?
What will be an ideal response?