Question

Which of the following statements is incorrect about DNA replication?

• A. DNA replication is semi-conservative
• B. Main enzyme for DNA replication is DNA polymerase
• C. Mutation appears due to error in replication
• D. Replication on both strands of DNA is continuous

Hint:

Remember: Leading strand → continuous, Lagging strand → Okazaki fragments (discontinuous).

Answer 1

The Correct Option is D

Step 1: Nature of DNA replication.
DNA replication is semi-conservative — each new DNA has one old and one new strand. DNA polymerase is the key enzyme.
Step 2: Leading and lagging strands.
Replication is continuous on the leading strand but discontinuous on the lagging strand (Okazaki fragments).
Step 3: Analyzing options.
(A) Correct — DNA replication is semi-conservative.
(B) Correct — DNA polymerase is the main enzyme.
(C) Correct — Errors during replication can cause mutations.
(D) Incorrect — Only leading strand is continuous; lagging is discontinuous.
Step 4: Conclusion.
Thus, the incorrect statement is Replication on both strands of DNA is continuous.