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After Watson and Crick's discovery of the structure of DNA, the mechanism by which it was copied before cell division was investigated.

Watson and Crick proposed that DNA consists of two
Select Option complementaryidenticalparallel
strands, and that these two strands could be separated to allow each one to act as a template for a new strand. Each new DNA molecule would, therefore, ​contain one original strand and one newly synthesized strand, a model known as
Select Option conservativedispersivesemiconservative
replication. This model was later shown to be correct by an experiment conducted by
Select Option Hershey and ChaseMeselson and StahlWatson and Crick
. In 1963, John Cairns studied the replication of the DNA in the chromosome of the bacterium E. coli. He showed the chromosome is
Select Option circularlinearsingle-stranded
, that replication begins at
Select Option a single point of origintwo points of origin at opposite endsmany points of origin
, and that replication proceeds
Select Option in both directionsin one direction
from each origin.
Select an assignment template