Histone proteins are not found in which type of DNA?

Histone proteins are not found in which type of DNA?

• A. Archaeal
• B. Eukaryotic
• C. Bacterial
• D. Viral

Answer: (C)

Histone proteins organize DNA into chromatin in eukaryotes, forming nucleosomes that package and regulate access to the genetic material. Archaea also have histone or histone-like proteins that can wrap DNA similarly. Bacteria, however, do not use histones; instead they rely on smaller nucleoid-associated proteins such as HU, IHF, FIS, and H-NS to compact and structure their chromosome, without forming nucleosome-like complexes. Viruses generally package their genomes with capsid proteins rather than histones, though there are rare exceptions where histone-like proteins appear in some giant viruses. So, the DNA that lacks histone-based packaging is bacterial DNA.

Histone proteins organize DNA into chromatin in eukaryotes, forming nucleosomes that package and regulate access to the genetic material. Archaea also have histone or histone-like proteins that can wrap DNA similarly. Bacteria, however, do not use histones; instead they rely on smaller nucleoid-associated proteins such as HU, IHF, FIS, and H-NS to compact and structure their chromosome, without forming nucleosome-like complexes. Viruses generally package their genomes with capsid proteins rather than histones, though there are rare exceptions where histone-like proteins appear in some giant viruses. So, the DNA that lacks histone-based packaging is bacterial DNA.