In Sea Urchins, the "Fast Block" and the Longer Lasting

question 37

Multiple Choice

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.

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