#Question id: 5659
#Unit 5. Developmental Biology
Following are the statements related to mammalian chaemotaxis .
A. During chaemotaxis, the oocyte and its accompanying cumulus cells secrete molecules that attract only uncapacitated sperm toward the egg during the last stages of sperm migration.
B. These chaemotactic compound are hormone progesterone, which is made by the cumulus cells.
C. Progesterone has been shown to bind to a receptor that activates Ca2+ channels in the cell membrane of the sperm tail, leading to sperm hyperactivity and provides directional cue.
D. Cumulus cells also secrete a substance, CRISP1, that attracts sperm and hyperactivates them through CatSper channels similar as in sea urchins.
Which of the following statement is incorrect?
#Question id: 5108
#Unit 5. Developmental Biology
The absence of limbs in snakes may be attributable to the evolution of changes in:
#Question id: 23419
#General Aptitude
#Question id: 12783
#Unit 10. Ecological Principles
#Question id: 1417
#Unit 4. Cell Communication and Cell Signaling
Which of the following triggers apoptosis?