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Q.

Which of the following structures is not found in a prokaryotic cell?

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a

Nuclear envelope

b

Ribosome

c

Mesosome

d

Plasma membrane

answer is C.

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Detailed Solution

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Nuclear envelope is not found in a prokaryotic cell. Prokaryotes lack true nucleus and the genetic material lies naked in the cytoplasm.
(1) Mesosomes are invaginations of the plasma membrane that are mostly found in gram positive bacteria.
(2) Plasma membrane is a structure that is present in both eukaryotes as well as prokaryotes.
(4) 70S ribosome is present in prokaryotes, mitochondria and plastids.

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