Which of the following events suggests there is a change in the egg cell membrane after penetration by a sperm?
A)The pollen tube grows away from the egg toward the polar nuclei.
B)Ca²⁺ builds up in the cytoplasm of the egg.
C)The egg cell plasmolyzes.
D)Double fertilization occurs.
E)There is a spike in membrane transport activity.

Question

Quizplus · Accepted Answer

The buildup of Ca²⁺ in the cytoplasm of the egg is a well-known event that occurs after sperm penetration, leading to changes in the egg cell membrane and initiating the block to polyspermy.

Which of the Following Events Suggests There Is a Change