What is the specific DNA sequence where DNA synthesis begins?

What is the specific DNA sequence where DNA synthesis begins?

• A. Origin of Replication
• B. Promoter
• C. Enhancer
• D. Terminator

Answer: (A)

DNA replication begins at a defined site on the chromosome called the origin of replication. This sequence is recognized by initiator proteins that recruit helicase to unwind the DNA and establish replication forks. From there, RNA primers are laid down and DNA polymerases extend the new strands. The other elements—promoter, enhancer, and terminator—are involved in transcription, not replication, so they do not mark where DNA synthesis starts. Therefore, the origin of replication is the correct starting point for DNA synthesis.

DNA replication begins at a defined site on the chromosome called the origin of replication. This sequence is recognized by initiator proteins that recruit helicase to unwind the DNA and establish replication forks. From there, RNA primers are laid down and DNA polymerases extend the new strands. The other elements—promoter, enhancer, and terminator—are involved in transcription, not replication, so they do not mark where DNA synthesis starts. Therefore, the origin of replication is the correct starting point for DNA synthesis.