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Use the diagram to answer the question.

What is Structure A?
plasmid

bacterium

cell

chromosome

answer:

Bacterial DNA – a circular chromosome plus plasmids

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 – small circular DNA molecules

Plasmids -- a genetic structure in a cell that can replicate independently of the chromosomes, typically a small circular DNA strand in the cytoplasm of a bacterium or protozoan. Plasmids are much used in the laboratory manipulation of genes.

Bacterial Cells -- It is a gel-like matrix composed of water, enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids. The cell envelope encases the cytoplasm and all its components. Unlike the eukaryotic (true) cells, bacteria do not have a membrane enclosed nucleus.

Chromosome -- a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes