Question

DNA replication is:

• A. Semi-Conservative
• B. Conservative
• C. Erratic
• D. Discontinuous

Hint:

DNA replication = Semi-conservative (1 old + 1 new strand)

Answer 1

The Correct Option is A

Concept:
DNA replication is the process by which a DNA molecule makes an exact copy of itself. The mechanism of replication follows a specific pattern.

Step 1: Understanding Semi-Conservative Model

• Each new DNA molecule contains:
• One original (parental) strand
• One newly synthesized strand

Step 2: Experimental Evidence

• Meselson and Stahl experiment proved this model.
• Showed that DNA replication is not fully conservative.

Step 3: Evaluating Other Options

• Conservative → Both strands remain intact (incorrect)
• Erratic → Not a biological model
• Discontinuous → Refers to lagging strand synthesis, not overall type Final Conclusion: \[ \boxed{\text{Semi-Conservative}} \]