A female vampire bat will regurgitate food to an unrelated female if needed, because at other times she may be the recipient of such a meal.

TLS Online TPP Program

#Id: 955

#Unit 5. Developmental Biology

Extension of the acrosomal process by the polymerization of G-actin molecules into F-actin by RhoB

TLS Online TPP Program

#Id: 956

#Unit 5. Developmental Biology

Acrosomal process have an insoluble, 30,500-Da protein called bindin.

TLS Online TPP Program

#Id: 957

#Unit 5. Developmental Biology

Species-specific bindin receptors present on the egg vitelline envelope.

TLS Online TPP Program

#Id: 958

#Unit 5. Developmental Biology

Fast block to polyspermy 

Within 1–3 seconds after the binding of the first sperm, the membrane potential shifts from -70mV to about +20 mV

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#Id: 959

#Unit 5. Developmental Biology

Slow block to polyspermy (cortical granule reaction) becomes active about a minute after the first successful sperm-egg fusion

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#Id: 960

#Unit 5. Developmental Biology

CGSP, an enzyme that cleaves the proteins linking the vitelline envelope to the cell membrane & also clips off the bindin receptors and any sperm attached to them.