_____ is an autonomously replicating circular extra-chromosomal DNA.ABacteriaBNitrogenous baseCRNADPlasmidAnswer: D. Plasmid Read Explanation: Plasmid is typically a small circular DNA strand in the cytoplasm of a bacterium or protozoan. It is a genetic structure in a cell that can replicate independently of the chromosomes. They are commonly used in recombinant DNA technology. Read more in App