The formation of the fertilisation envelope requires an increase in the cytosolic concentration of ________.
A) calcium ions
B) hydrogen ions
C) potassium ions
D) sodium ions

Question

Quizplus · Accepted Answer

The formation of the fertilisation envelope in sea urchins requires an increase in the cytosolic concentration of calcium ions, which triggers the cortical granules to release their contents and form the envelope. This increase in calcium ions is also important for other aspects of fertilisation, such as the sperm-egg fusion and the activation of the egg. Therefore, choice A) is the best answer.

The Formation of the Fertilisation Envelope Requires an Increase in the Cytosolic