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 calcium ions (Ca2⁺) in the cytoplasm of the egg is a well-known event that occurs after sperm penetration, indicating changes in the egg cell membrane and initiating the egg activation process.

Which of the Following Events Suggests There Is a Change