EVERYDAY SCIENCE

Detailed explanation-1: -In organisms such as humans, DNA is organised into structures called chromosomes inside a nucleus, a membrane-bound compartment within each cell. Bacteria lack a nucleus, and how bacterial DNA is organised has puzzled biologists for many years.

Detailed explanation-2: -Bacteria lack a membrane-bound nucleus and other internal structures and are therefore ranked among the unicellular life-forms called prokaryotes.

Detailed explanation-3: -Prokaryotic cells, such as bacteria, have a free-floating chromosome that is usually circular and is not enclosed in a nuclear membrane. Instead, the DNA simply exists in a region of the cell called the nucleoid. Prokaryotic cells only have a small range of organelles, generally only a plasma membrane and ribosomes.

Detailed explanation-4: -Unlike eukaryotes, which possess a membrane-bound nucleus that protects the organism’s DNA, bacterial cells possess a single strand of circular DNA (chromosomal loop) located in the nucleoid region. The nucleoid region represents the part of the cell where the genetic material is concentrated.