The formation of the fertilization envelope in a sea urchin egg is most directly stimulated by an increase in the cytosolic concentration of which of the following ions?
A) calcium ions
B) hydrogen ions
C) potassium ions
D) sodium ions

Question

Quizplus · Accepted Answer

The formation of the fertilization envelope in a sea urchin egg is directly stimulated by an increase in the cytosolic concentration of calcium ions. This process is crucial for preventing polyspermy, ensuring that only one sperm fertilizes the egg.

The Formation of the Fertilization Envelope in a Sea Urchin