Which among the following is absent in eukaryotes?
A
Mesosomes
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B
Plasma membrane
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C
Cell wall
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D
Nucleus
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Solution
The correct option is A Mesosomes Mesosomes are extensions of the plasma membrane and are known to contain respiratory enzymes. This is a characteristic feature of prokaryotic cells. Plasma membranes and cell walls are present in both prokaryotic and eukaryotic cells (animal cells lack cell walls). A well defined nucleus is a feature of eukaryotes while prokaryotes lack a true nucleus, which in them is termed as nucleoid.