Discussion
Which of the following statement describes plasmids?
Answer: C
Correct answer: Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
A plasmid is a small, usually circular DNA molecule that replicates independently of the bacterial chromosome. It has its own origin of replication, so it is a replicon in its own right, and it carries accessory genes that are useful in some environments but not required for growth.
A protoplast is a cell stripped of its wall, and the membrane structure covering the bacterial chromosome describes the nucleoid or the mesosome rather than a plasmid. The defining features to remember are independent replication and dispensability.
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