A chromosome is an 'X' shaped gene which contains DNA, found inside living cells. Chromosomes are easily seen using a microscope and are normally invisible most of the time (tâ¦his period of time called 'interphase') but become visible when the cell starts to multiply.
Bacterial DNA â a circular chromosome plus plasmids. The DNA of most bacteria is contained in a single circular molecule, called the bacterial chromosome. The chromosome, along with several proteins and RNA molecules, forms an irregularly shaped structure called the nucleoid.This sits in the cytoplasm of the bacterial cell.In addition to the chromosome, bacteria often contain plasmids â small circular DNA molecules. Bacteria can pick up new plasmids from other bacterial cells (during conjugation) or from the environment.his sits in the cytoplasm of the bacterial cell. In addition to the chromosome, bacteria often contain plasmids â small circular DNA molecules. Bacteria can pick up new plasmids from other bacterial cells (during conjugation) or from the environment.
Prokaryotes. Bacteria are prokaryotes. They do not have a membrane-bound nucleus and their DNA is free in the cytoplasm. Bacteria have a single circular chromosome in the centre of the cell that holds all the genes needed for that bacterium.Bacteria also have extra circles of DNA called plasmids.NA is present in the cells of every living thing. However, the DNA is organised differently in different types of organism. We can divide cells into two groups based on how they organise their DNA â eukaryotes and prokaryotes.