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Home Q & A Board Biology-Related Homework Help Cell Biology
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daniellelady daniellelady
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6 years ago
During fertilization in humans, _______________________.
 
  (a) a wave of Ca2+ ions is released in the fertilized egg's cytoplasm.
  (b) only one sperm binds to the unfertilized egg.
  (c) a sperm moves in a random fashion until it encounters an egg.
  (d) several sperm pronuclei compete in the cytoplasm to fuse with the egg nucleus.
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#1
6 years ago
Choice (a) is correct. Many sperm can bind to an egg choice (b). Cells surrounding the egg release a chemoattractant signal, attracting the sperm to the correct place; sperm are moving toward the chemoattractant signal and not moving randomly choice (c). Mechanisms exist to ensure that only one sperm fertilizes each egg, and thus only one sperm pronucleus will reach the cytoplasm of the egg choice (d).
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