Question

What direction does DNA replication occur along?

• A. 3’$\to$5’
• B. 5’$\to$3’
• C. Any direction
• D. No specific direction

Answer 1

The correct option is B

5’$\to$3’

DNA replication always happens in the 5’$\to$ 3’ direction. This is because the enzyme DNA polymerase, responsible for adding nucleotides to the new strands being formed, can add nucleotides only to the 3’ end of an RNA primer.