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Q.

Eventhough human is thermoregulator, he cannot survive when his body temperature raises above 400C(heat stroke).  While archaebacteria have thermal tolerance above 1000C in hydrothermal vents.  Why?

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a

Humans cannot sweat

b

DNA and proteins of Archaebacteria denature at high temperatures

c

Archaean cell membrane is composed of glycerol ether lipids

d

They are chemoautotrophs

answer is C.

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Detailed Solution

The DNA and proteins do not denature at high temperature.  Their cell membrane resist high temperature due to presence of glycerol linked to hydrocarbon chains by ether linkage.
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