NEET BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -While eukaryotic and prokaryotic cells both contain cytoplasm and a membrane that encloses the contents of the cell, only eukaryotes possess a membrane-bound nucleus. Prokaryotes, by contrast, have cells without a nucleus. Instead, prokaryotic cells possess a nucleoid region, which is not bound by a membrane.

Detailed explanation-3: -Prokaryotes do not have a well defined nucleus. Instead they have an irregularly shaped structure called the nucleoid which contains the genetic material of the organism.

Detailed explanation-4: -The bacterial genome is present in the cell within a complex structure, the nucleoid. The nucleoid contains the genomic DNA, and molecules of RNA and proteins. The main proteins of the nucleoid are: RNA polymerase, topoisomerases and the histone-like proteins: HU, H-NS (H1), H, HLP1, IHF and FIS.

Detailed explanation-5: -Bacteria are prokaryotes which do not have a well-defined nucleus. Nucleoid is a region in the prokaryotic cell, where its most of the genetic material resides. It is not a well-defined membrane-bound region. Pro-chromosome is present in bacterial cells.