Which ion is responsible for protecting the egg from further fertilization? A) H+ B) Na+ C)...

Which ion is responsible for protecting the egg from further fertilization?

A)

H+

B)

Na+

C)

Ca2+

D)

K+

E)	None of the above

Expert Solution

Ans- C ( In mammals, where fertilization occurs internally i.e egg fuse with single sperm to form zygote and it is important that no additional sperm fuse with the zygote's plasma membrane.In mammals this is achieved by immediate changes in electrical properties of the plasma membrane (fast block within second or slow block within minute). The Zona reaction occurs within a minutes of fertilization and it is induced by the content of cortical granules,small membrane bound organelles that underly the egg plasma membrane,which are deposite into the zona pellucida following the cortical reaction which involves fusion of cortical granules and plasma membrane with exocytosis of cortical granules contents into the zona pellucida and this reaction occurs due to release of Ca⁺² from egg cytoplasm, causes hardening of the zona pellucida so binding of additional sperm to the zona pellucida are prevented.

gladiator answered 2 years ago

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