General Science • BiologyHard
Consider the following statements regarding nucleic acid structure and replication: 1. DNA replication is semiconservative, where each newly formed daughter molecule retains one original parent strand and one newly synthesized strand. 2. Uracil pairs with adenine through three hydrogen bonds in double-stranded DNA molecules. Which of the statements given above is/are correct?
A. 1 only✓ Correct Answer
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
💡 Solution & Explanation
Statement one is correct because DNA replication follows a semiconservative mode proven experimentally by Meselson and Stahl using isotopic nitrogen labeling. Statement two is incorrect because uracil is found exclusively in RNA replacing thymine, whereas DNA utilizes thymine which pairs with adenine via two hydrogen bonds. Genetic information storage and transmission depend heavily upon precise base-pairing rules.
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