The most important chemical stimuli leading to increased rate and depth of breathing is:

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#Question id: 23696

#Unit 13. Methods in Biology

which of the following best describes the complete sequence of steps occurring during every cycle of PCR?

1. The primers hybridize to the target DNA.

2. The mixture is heated to a high temperature to denature the double stranded target DNA.

3. Fresh DNA polymerase is added.

4. DNA polymerase extends the primers to make a copy of the target DNA.

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#Question id: 3830

#Unit 3. Fundamental Processes

Why is DNA damage in skin cells from exposure to excessive UV light not completely reversed by photoreactivation?

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#Question id: 7113

#Unit 5. Developmental Biology

In flies, frogs, and chicks, gradients of morphogens determine the future antero-posterior and dorso-ventral axes of the developing embryo. How is the antero-posterior axis determined in C. elegans?

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#Question id: 28848

#Unit 2. Cellular Organization

A protein is accelerating polymerization of microtubule, by binding with free tubulin subunits, that protein is____

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#Question id: 23082

#Unit 12. Applied Biology

The technique of organ culture may be divided on the basis of employing

a) solid medium

b) liquid medium

c) semi-solid medium