Which one of the following structure is NOT found in prokaryotes ?

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Which one of the following structure is NOT found in prokaryotes ?

Nuclear envelope
Cell membrane
Ribosome
Cell wall
This question was previously asked in
UPSC CAPF – 2024
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The correct option is A. The nuclear envelope is a structure that is NOT found in prokaryotes.
– Prokaryotic cells (like bacteria and archaea) lack a true nucleus and other membrane-bound organelles.
– The genetic material (DNA) in prokaryotes is located in a region called the nucleoid, which is not enclosed by a membrane.
– The nuclear envelope is the double membrane that surrounds the nucleus in eukaryotic cells.
Cell membranes are present in all cells, prokaryotic and eukaryotic, as they define the cell boundary. Ribosomes, responsible for protein synthesis, are also present in both prokaryotes and eukaryotes, although they differ slightly in size (70S in prokaryotes, 80S in eukaryotes). Cell walls are present in most prokaryotes (like bacteria) and some eukaryotes (like plants and fungi), but not in animal cells.

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