AIIMS 2019 Botany DNA Composition MCQ Question
Percentage of (G + C) is
(G⁺C)/(A⁺G⁺T⁺C)×100
100/(A⁺T)×G⁺C
(G⁺C)/(A⁺G⁺T⁺C)
(G⁺C)×(A⁺T)/100
Correct Answer
Detailed Explanation
Option D calculates the percentage of guanine (G) and cytosine (C) in a DNA molecule by multiplying the sum of G and C by the total number of bases (A + T) and dividing by 100. This reflects the proportion of G + C relative to the total nucleotide content, which is essential for understanding DNA composition.
In contrast, option A incorrectly represents the percentage as a fraction without multiplying by 100, while option B misapplies the formula by dividing instead of multiplying, and option C fails to express the result as a percentage. Understanding these distinctions is crucial for accurately analyzing nucleotide composition in molecular biology.
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