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.
The viral DNA usurps the machinery of the cell for the replication of viral DNA and protein which is assembled into a crop of progeny phage which are released by lysis from the cell. Called also bacterial virus.M13 bacteriophage.or simply phage; a virus that infects bacteria often killing them by lysis; many varieties exist, and usually each attacks only one kind of bacteria. Some bacteriophages are widely used as cloning vectors and for determining DNA sequence.he viral DNA usurps the machinery of the cell for the replication of viral DNA and protein which is assembled into a crop of progeny phage which are released by lysis from the cell. Called also bacterial virus.