#Question id: 5556
#Unit 5. Developmental Biology
Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.
#Question id: 5557
#Unit 5. Developmental Biology
The plasma membrane of the sea urchin egg ________.
#Question id: 5559
#Unit 5. Developmental Biology
During fertilization, the acrosomal contents ________.
#Question id: 5560
#Unit 5. Developmental Biology
In a newly fertilized egg, the vitelline layer ________.
#Question id: 5561
#Unit 5. Developmental Biology
In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.
#Question id: 5562
#Unit 5. Developmental Biology
In an egg cell treated with a chemical that binds calcium and magnesium ions, the ________.