#Question id: 5613
#Unit 5. Developmental Biology
Female mice with the CD9 gene knocked out are infertile because
#Question id: 5614
#Unit 5. Developmental Biology
One difference between the blastula and gastrula stages of development is that
#Question id: 5615
#Unit 5. Developmental Biology
The fast block to polyspermy is achieved by:
#Question id: 5616
#Unit 5. Developmental Biology
In the sperm the elevated Ca2+ level in a relatively basic cytoplasm triggers
#Question id: 5617
#Unit 5. Developmental Biology
In sea urchins and mammals, the rise in Ca2+ concentration responsible for the cortical granule reaction is due to
#Question id: 5618
#Unit 5. Developmental Biology
Mouse cumulus cells also secrete a substance that attracts sperm and hyperactivates them through calcium ion channels. The substance is