A Small Circle of DNA in Some Bacteria and Archaea

Question

A small circle of DNA in some bacteria and archaea is known as ______.  
A) cytosol
B) ribosome
C) plasmid
D) pilus
E) biofilm

Accepted Answer

Plasmids are small circles of DNA that can replicate independently from the chromosomal DNA in bacteria and some archaea. They often carry genes that provide advantages to the bacteria, such as antibiotic resistance or the ability to form biofilms. Cytosol refers to the liquid component of a cell, ribosomes are cellular structures involved in protein synthesis, pili are hair-like structures on the surface of bacteria used for attachment or movement, and biofilms are communities of microorganisms that stick to surfaces and secrete a protective matrix.