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: 10981

#Unit 7. System Physiology – Animal

Which of the following structures will have the slowest rate of conduction of the cardiac action potential?

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#Question id: 628

#Unit 1. Molecules and their Interaction Relevant to Biology

At fixed substrate concentration, which of the following equation is correct for Dixon plot

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#Question id: 11190

#Unit 7. System Physiology – Animal

For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in the ________.

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#Question id: 23661

#Unit 13. Methods in Biology

Which is(are) appropriate for use as a labeled probe(s) to screen a DNA library?

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#Question id: 8919

#Unit 9. Diversity of Life Forms

The last common ancestor of all animals was probably a