NEET BIOLOGY

Detailed explanation-1: -Solution : (b) Nucleoid or chromatin body or genophore in bacteria occupies 10-20% of cell, is present near the centre of cell. It consists of a single, circular DNA molecule in which all the genes are linked. It is over a thousand times longer than the cell itself and is, therefore, highly folded.

Detailed explanation-2: -A circular chromosome is a chromosome in bacteria, archaea, mitochondria, and chloroplasts, in the form of a molecule of circular DNA, unlike the linear chromosome of most eukaryotes.

Detailed explanation-3: -Bacteria contain a single chromosome of double-stranded deoxyribonucleic acid (DNA).

Detailed explanation-4: -Not all bacteria have a single circular chromosome: some bacteria have multiple circular chromosomes, and many bacteria have linear chromosomes and linear plasmids.

Detailed explanation-5: -Bacteria are single-celled prokaryotic organisms that lack membrane-bound cell organelles. The true nucleus is absent and is not surrounded by a nuclear membrane. As a result, it is made up of double-stranded circular DNA.