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MDCAT Biology QUESTION #11279
Question 1
Which of the following statements about DNA replication is CORRECT?
  • It is conservative — the original double helix remains intact
  • It is semiconservative — each new DNA molecule has one old and one new strand✔️
  • It is dispersive — old and new DNA are interspersed in both strands
  • It occurs only during meiosis
Correct Answer Explanation
DNA replication is semiconservative (Meselson-Stahl experiment, 1958). Each daughter DNA molecule consists of one parental (old) strand and one newly synthesized strand. It occurs during the S phase of interphase in both mitosis and meiosis.