Once the cortical granules release their enzymes, the corona radiata becomes the fertilization membrane. Group of answer choices True False
Added by Tiffany P.
Step 1
- Cortical granules are small organelles found in the egg cell (oocyte). - The corona radiata is a layer of follicular cells that surround the egg cell. Show more…
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After a spermatozoa penetrates an oocyte, it triggers cortical granule exocytosis. The granules release ___________ , and this allows for the influx of ___________ and this causes the formation of the ___________. Which of the following best fills in the blanks? Ca2+ , peroxide, fertilization envelope Serine proteases, H20, fertilization envelope H2O2, ZP3 , acrosomal vesicle PIP2, Ca2+, pronucleus
Nicholas M.
Adi S.
Imagine there was an abnormality with the sperm in this figure, preventing the cortical granules from fusing the plasma membrane in step [4]. What do you predict would happen in the fertilization process? Nothing will happen, as the cortical granules do not fuse with the plasma membrane; rather, they prevent polyspermy from occurring by making the egg's internal charge more positive. The egg cell would likely continue through to step [5], but egg activation and increased cellular respiration is unlikely to occur. The egg cell would revert back to step [3] until the cortical vesicles fuse, triggering the fast block to polyspermy. It is unlikely that the fertilization envelope world form, preventing the slow block to polyspermy from taking place. This would increase the odds of polyspermy occurring.
Rabia S.
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