Which one of the following cell organelles is not lined by membrane ?

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Which one of the following cell organelles is not lined by membrane ?

Lysosome
Ribosome
Nucleus
Golgi Apparatus
This question was previously asked in
UPSC CISF-AC-EXE – 2022
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Cell organelles in eukaryotic cells are often enclosed by membranes. The question asks which of the listed organelles is not lined by a membrane.
– Lysosome: Lined by a single membrane.
– Ribosome: Composed of ribosomal RNA (rRNA) and proteins, not enclosed by a membrane.
– Nucleus: Enclosed by a double membrane (the nuclear envelope).
– Golgi Apparatus: Composed of membrane-bound sacs (cisternae), lined by a single membrane.
Ribosomes are responsible for protein synthesis and are found in both prokaryotic and eukaryotic cells (though they differ in size/structure). Their lack of a membrane is a key structural feature that distinguishes them from many other organelles in eukaryotic cells. Other non-membrane-bound structures in eukaryotic cells include the nucleolus, centrioles, and components of the cytoskeleton.

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