#Question id: 18749
#Unit 13. Methods in Biology
#Question id: 18989
#Unit 13. Methods in Biology
#Question id: 5671
#Unit 5. Developmental Biology
Match the following mechanism of polyspermy (Column I) with events (Column II).
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Column I |
Column II |
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A. Fast block to polyspermy |
i. chemicals from the fusing sperm cytoplasm alter the sodium ion (Na+) channels on the membrane |
|
B. Slow block to polyspermy |
ii. enzyme cortical granule serine protease, cleaves the protein posts that connect the vitelline envelope |
|
iii the concentration of free Ca2+ in the egg cytoplasm increases |
|
|
iv. an electric change in the egg cell membrane |
|
|
v. the concentration of free Na+ in the egg cytoplasm increases |
Which of the following is correct?
#Question id: 11947
#Unit 7. System Physiology – Animal
Why is milk produced only after delivery, not before?
#Question id: 4138
#Unit 3. Fundamental Processes
In bacteria the elongation stage of protein synthesis does not involve: