Absolutely! Let’s break down the diagram and the concept of DNA replication at the replication fork, especially focusing on why D ➔ B is the leading strand.🧬
DNA Replication Basics
:
- DNA strands run antiparallel (one runs 5’ → 3’, the other 3’ → 5’).
- DNA polymerase can only add new nucleotides in the 5’ to 3’ direction.
- The replication fork is the area where the double helix is unwound to expose the two single strands for copying.
🔄
Leading vs. Lagging Strand
:
When the fork opens up:
✅
Leading Strand
:
- Synthesized continuously in the same direction as the replication fork is moving.
- New nucleotides are added one after another — smooth, no breaks.
- Uses the 3’ to 5’ template strand so that it can build 5’ to 3’.
🔁
Lagging Strand
:
- Synthesized in the opposite direction of the replication fork movement.
- Made in short segments called Okazaki fragments.
- Each fragment is later joined by enzymes.
📊
In Your Diagram
:
