Which of the following events suggests there is a change in the egg cell membrane after penetration by a sperm?

Question

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The increase in Ca2+ concentration in the cytoplasm of the egg is a well-known event that signals a change in the egg cell membrane after penetration by a sperm. This rise in Ca2+ initiates a series of events, including the release of cortical granules, that will result in the hardening and thickening of the egg's outer membrane, forming the fertilization envelope. The other events listed (A, C, and D) are unrelated to changes in the egg cell membrane after fertilization.

Which of the Following Events Suggests There Is a Change