Question

On a DNA strand that is being used as a template, where is the copying occurring relative to the replication origin

(a) 3′ end of the origin
(b) 5′ end of the origin
(c) Both ends of the origin

Answer 1

DNA replication occurs in both ends of the replication origin.

Step-by-step explanation:

The copying of a DNA strand occurs in both ends of the replication origin. During DNA replication, the DNA molecule unwinds at the origin of replication and two replication forks are formed. DNA polymerase reads the template strand in the 3' to 5' direction and adds nucleotides only in the 5' to 3' direction. The leading strand is synthesized continuously towards the replication fork, while the lagging strand is synthesized away from the replication fork in small fragments called Okazaki fragments.