Question

The site on DNA where replication starts is called _______________.

• A. GC region
• B. parental strand
• C. origin of replication or (ORI)
• D. daughter strand

Answer 1

The correct option is C origin of replication or (ORI)

DNA replication cannot be initiated randomly at any place in the DNA. There are definite regions which act as sites for the initiation of the process of replication. These sites are also known as Origin of Replication. ORIs consist of a stretch of DNA having a higher proportion of AT rich sequences which can easily be acted upon by helicase Helicase helps to unwind the double stranded DNA at the origin of replication, hence a replication fork is formed.