Bacteria have an undefined nuclear region which lacks a nuclear membra

Bacteria have an undefined nuclear region which lacks a nuclear membrane and contains only DNA without proteins. Such a region is called :

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Nucleosome

Nucleus

Nucleoprotein

Nucleoid

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UPSC CDS-2 – 2023

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Bacteria are prokaryotic organisms, meaning their cells lack a membrane-bound nucleus and other membrane-bound organelles. The genetic material (DNA) in a bacterial cell is located in an irregularly shaped region within the cytoplasm. This region, where the bacterial chromosome (usually a single, circular DNA molecule) is concentrated, is called the nucleoid. Unlike eukaryotic chromosomes, bacterial DNA is not associated with histone proteins to the same extent.

The nucleoid contains the genomic DNA and associated proteins in a prokaryotic cell, but it is not enclosed by a nuclear membrane, distinguishing it from the true nucleus found in eukaryotic cells.

A nucleosome (option A) is the basic structural unit of DNA packaging in eukaryotes, consisting of DNA wrapped around histone proteins. A nucleus (option B) is the membrane-bound organelle containing genetic material in eukaryotes. Nucleoprotein (option C) is a general term for any complex of nucleic acid and protein, and while the nucleoid contains nucleoproteins, “nucleoid” is the specific term for the region itself.

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