The “fast block” to polyspermy is due toa) depolarisation of the egg membrane.b) an increase in concentration of Ca 2+ ions.c) fusion of cortical granules with the egg membrane.d) activation of the egg
Question
The “fast block” to polyspermy is due toa) depolarisation of the egg membrane.b) an increase in concentration of Ca 2+ ions.c) fusion of cortical granules with the egg membrane.d) activation of the egg
Solution
The "fast block" to polyspermy is due to a) depolarisation of the egg membrane.
Here's a step-by-step explanation:
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When a sperm first binds to an egg, it triggers a rapid change in the egg's membrane potential. This is known as depolarisation.
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This depolarisation acts as a "fast block" to polyspermy, which is the fertilisation of an egg by more than one sperm.
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The change in membrane potential prevents other sperm from binding to the egg.
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This is a very quick response, happening within seconds of the sperm's attachment, and it is temporary.
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The "slow block" to polyspermy, which involves the release of cortical granules and the hardening of the egg's outer layer, happens later.
So, the correct answer to your question is a) depolarisation of the egg membrane.
Similar Questions
The slow block to polyspermy is due toa) a transient voltage change across the membrane.b) the consumption of yolk protein.c) the jelly coat blocking sperm penetration.d) formation of the fertilization envelope
Which of the following is involved in the prevention of polyspermy?Multiple Choiceacrosome of the spermdepolarization of the egg's plasma membranefusion of the sperm and egg nucleuschanges within the corona radiatathe number of chromosomes contained within the sperm
After the fertilization of a sea urchin egg, the influx of which ion prevents polyspermy?Multiple choice question.SodiumChlorideCalciumPotassium
Which of the following macromolecules attracts water into the space between the vitelline envelope and the egg surface, preventing polyspermy in sea urchins?Multiple choice question.GlucoseCholesterolHyaluronic acidHyalin
Morphogens are molecules that Blank______.Multiple choice question.create a concentration gradient to determine cell fatechange the DNA of a cell, which results in changes to the developmental fate of that cellserve as enhancers to repress or activate transcription of genesplay an important role in blocking polyspermy
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