Which Statement Characterizes the Slow Block to Polyspermy in Sea

question 208

Multiple Choice

Which statement characterizes the slow block to polyspermy in sea urchins?

• A) It makes the vitelline envelope penetrable to sperm.
• B) It involves enzymes from cortical granules dissolving the bonds between the vitelline envelope and plasma membrane.
• C) It includes a transient change in membrane potential.
• D) It is initiated by the loss of calcium ions from the egg's cytoplasm.
• E) It involves enzymes from lysosomes degrading sperm-binding molecules on the inner surface of the egg cell membrane.

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Definitions:

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