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?

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#Question id: 18876

#Unit 9. Diversity of Life Forms

Each of the following is a general characteristic of bryophytes except 

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#Question id: 12089

#Unit 10. Ecological Principles

The massive adaptive radiation of insects over the world is most likely related to the

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#Question id: 11561

#Unit 7. System Physiology – Animal

An example of antagonistic hormones controlling homeostasis is ________.

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#Question id: 88

#Unit 1. Molecules and their Interaction Relevant to Biology

Anomers can be interconverted ________.

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#Question id: 8716

#Unit 9. Diversity of Life Forms

The most important feature that permits a gene to act as a molecular clock is ________.