MDCAT Biology MCQ #891

In a double-stranded DNA sample, the percentage of Guanine is determined to be 20%. According to Chargaff's rule, what is the percentage of Thymine?

MDCAT Biology MCQ #891

  1. Question 1

    Q1. In a double-stranded DNA sample, the percentage of Guanine is determined to be 20%. According to Chargaff's rule, what is the percentage of Thymine?

    • A) 20%
    • B) 30%
    • C) 40%
    • D) 60%

    Answer: 30%

    Explanation: If Guanine is 20%, Cytosine is 20% (40% total). The remaining 60% is shared equally by Adenine and Thymine (30% each).