Practice Questions

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#Question id: 7310

Which statement best describes the mechanism for circadian rhythm?

#Unit 5. Developmental Biology

There is an alternation between enhanced and inhibited expression of clock genes.
Clock genes inhibit gene expression of positive elements.
Clock genes inhibit expression of negative elements.
The time-keeping mechanism depends only on the breakdown of negative elements.

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#Question id: 5619

#Unit 5. Developmental Biology

Acrosome intact- sperm and acrosome reacted- sperm bind to which of the zona protein respectively?

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#Question id: 13053

#Unit 13. Methods in Biology

What would the generally expected effect on the PCR reaction be of adjustments that increase the temperature of the annealing phase and the length of the elongation phase?

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#Question id: 14146

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following

A. Cyanide 1. Inhibit cytochrome oxidase

B. Piericidin A 2. Prevent electron transfer from Fe-S center to ubiquinone

C. Antimycin A 3. Blocks electron transfer from cytochrome b to cytochrome c1

D. Valinomycin 4. K+ ionophore

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#Question id: 12860

#General Aptitude

Through each vertex of a triangle, a line parallel to the opposite side is drawn. The ratio of the perimeter of the new triangle,thus formed, with that of the original triangle is

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#Question id: 1095

#Unit 4. Cell Communication and Cell Signaling

What does it mean to say that a signal is transduced?