In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are _____
A) the acrosomal reaction and the formation of egg white
B) the cortical reaction and the formation of yolk protein
C) the jelly coat of the egg and the vitelline membrane
D) membrane depolarization and the cortical reaction
E) inactivation of the sperm acrosome
Answer: D
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What will be an ideal response?
How might global warming affect an animal species that has narrow temperature requirements?
A) It may cause the expansion of the species' range. B) It may cause the extinction of the species. C) It may reduce the diseases that threaten the species. D) It may have no effect on the species.
A tumor located in the primary somatosensory area would impact which of the following functions?
A. the ability to smell B. the ability to feel a rough object C. the ability to determine images D. the ability to swallow E. all of these
The principal microtubule-organizing center in animal cells is the ____________
(a) centrosome. (b) centromere. (c) kinetochore. (d) cell cortex.