Practice question
Question
The data below are from a Meselson-Stahl type of experiment. Which model of DNA replication is supported by the results shown in the table below? ᴳᵉⁿᵉʳᵃᵗⁱᵒⁿ % ᴴᵉᵃᵛʸ ᴰᴺᴬ % ᴴʸᵇʳⁱᵈ ᴰᴺᴬ % ˡⁱᵍʰᵗ ᴰᴺᴬ ¹ ¹⁰⁰ ⁰ ⁰ ² ⁵⁰ ⁰ ⁵⁰ ³ ²⁵ ⁰ ⁷⁵ ⁴ ¹².⁵ ⁰ ⁸⁷.⁵ ᴳᵉⁿᵉʳᵃᵗⁱᵒⁿ % ᴴᵉᵃᵛʸ ᴰᴺᴬ % ᴴʸᵇʳⁱᵈ ᴰᴺᴬ % ˡⁱᵍʰᵗ ᴰᴺᴬ ¹ ¹⁰⁰ ⁰ ² ⁵⁰ ³ ²⁵ ⁷⁵ ⁴ ¹².⁵ ⁸⁷.⁵
Explanation
nucleic acid structure and recombination analysis shows hairpin formation, Holliday junction resolution and translation control ensure fidelity. Consequently DNA replication is conservative emerges as the valid choice since it matches molecular mechanisms, aligning with established principles in molecular biology literature.
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