Which one of the following events immediately follows the entry of a spermatozoan into an oocyte
Which one of the following events immediately follows the entry of a spermatozoan into an oocyte
- A
An increase in the permeability of the oocyte membrane
- B
An increase in activity of proteolytic enzymes
- C
A decrease in the metabolic rate of the oocyte
- D
Thickening of the vitelline membrane
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