Circular DNA molecules found in nature are
A)positively supercoiled.
B)negatively supercoiled.
C)not supercoiled,due to their small size.
D)always oriented in a triple helix to conserve space.
E)always in the Z-DNA formation.

Question

Quizplus · Accepted Answer

Negatively supercoiled DNA is common in nature because it allows for easier unwinding and separation of the two strands, which is necessary for processes such as replication and transcription. Positive supercoiling does occur under certain conditions, but negative supercoiling is more prevalent in living cells. Circular DNA molecules, such as plasmids in bacteria, are often negatively supercoiled to facilitate these essential biological processes.

Circular DNA Molecules Found in Nature Are