The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

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#Question id: 1091

#XL - Q Biochemistry

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

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#Question id: 9578

#XL - T Zoology

Bergmann’s rule states that,

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#Question id: 20133

#XL - P Chemistry

For the combustion of 1 mole of liquid benzene at 25ºC, the heat of reaction at constant pressure is given by, C6H6(l) + 7 O2 (g) → 6CO2 (g) + 3H2O (l); DH = –780980 cal.

What would be the heat of reaction at constant volume?

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#Question id: 2390

#XL - Q Biochemistry

In addition to self assembly, enzymes may facilitate wall assembly. A prime candidate for enzyme-mediated wall assembly is-

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#Question id: 3646

#XL - S Microbiology

Both leading and lagging strand primers are elongated by: