The cortical reaction of sea urchin eggs functions directly in _____
A) the formation of a fertilization envelope
B) the production of a fast block to polyspermy
C) the release of hydrolytic enzymes from the sperm
D) the generation of an electrical impulse by the egg
A
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A normal blood pressure for a man in his late forties is 130/82 mm Hg. Explain the two numbers and what they mean.
What will be an ideal response?
The reason scientists hope to develop personalized stem cell therapies is that these therapies would avoid the problem of
A. tissue rejection. B. side effects of medication. C. the expense of organ transplantation. D. long wait times associated with organ donation. E. None of these choices are correct.
A tick is a(n) _____
a. brood parasite c. endoparasite b. ectoparasite
The percentage of different colored water boatmen eaten by fish were graphed relative to the frequency of that color in the population. Based on the graph, a population of water boatmen would ________
A. lose rare genotypes. B. increase in size. C. increase in rare genotypes. D. have no variation in genotype frequencies. E. decrease in genetic variability.