25-hydroxycholecalciferol is converted to the more active metabolite 1,25-dihydroxycholecalciferol in which of the following cell ?

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#Question id: 1992

#Unit 4. Cell Communication and Cell Signaling

How do antibodies of the different classes IgM, IgG, IgA, IgD, and IgE differ from each other ?

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#Question id: 18832

#Unit 13. Methods in Biology

The following PCR technique allows measuring the DNA amplification at each cycle of PCR contrary to end point detection in traditional PCR

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#Question id: 29007

#Unit 7. System Physiology – Animal

Osteoblast proteins responsible for osteoclast maturation such as:

I- Inhibiting OPG production

II- Receptor activator for nuclear factor κ-B ligand  

III- Macrophage colony-stimulating factor

IV- Stimulating RANKL formation

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#Question id: 4977

#Unit 11. Evolution and Behavior

There are at least a dozen known species in the extinct genus Lystrosaurus. If each species was suited to a quite different environment, then this relatively large number of species is likely due to

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#Question id: 7549

#General Aptitude

A car travels 8 km in the first quarte of an hour, 6 km in the second quarter and 16Km in the third quarter. The average speed of the car in km per hour over the entire Journey is