In Sea Urchins, Which of the Following Pairs of Events

question 15

Multiple Choice

In sea urchins, which of the following pairs of events most directly results in the short-lasting "fast block" and the longer-lasting "slow block" to polyspermy, respectively?

• A) the acrosomal reaction and vitellogenesis
• B) the cortical reaction and the formation of yolk protein
• C) formation of the jelly coat and the vitellin membranes
• D) membrane depolarization and the cortical reaction

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