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.