In DNA replication in bacteria, the enzyme DNA polymerase III (abbreviated DNA p
ID: 3512627 • Letter: I
Question
In DNA replication in bacteria, the enzyme DNA polymerase III (abbreviated DNA pol III) adds nucleotides to a template strand of DNA. But DNA pol III cannot start a new strand from scratch. Instead, a primer must pair with the template strand, and DNA pol III then adds nucleotides to the primer, complementary to the template strand. Each of the four images below shows a strand of template DNA (dark blue) with an RNA primer (red) to which DNA pol III will add nucleotides.
In which image will adenine (A) be the next nucleotide to be added to the primer?
Explanation / Answer
Image 1 is the correct answer.
The synthesis of new DNA strand catalysed by DNA polymerase ||| occurs in 5'-3' direction,which is antiparallel to the template DNA.
Now, the presence of nucleotides is important for this,
Base G binds to base C.
Base A binds to base T.
As primer is present on the left hand side on the image.