#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 ________.
#Question id: 5563
#Unit 5. Developmental Biology
In mammalian eggs, the receptors for sperm are found in the ________.
#Question id: 5564
#Unit 5. Developmental Biology
At the moment of sperm penetration, human eggs ________.
#Question id: 5565
#Unit 5. Developmental Biology
Among these choices, the largest cell involved in frog reproduction is ________.