MDCAT Biology MCQ #782

A DNA sample analysis shows that 30% of the nitrogenous bases are Adenine. What is the expected percentage of Thymine in this sample?

MDCAT Biology MCQ #782

  1. Question 1

    Q1. A DNA sample analysis shows that 30% of the nitrogenous bases are Adenine. What is the expected percentage of Thymine in this sample?

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

    Answer: 30%

    Explanation: According to Chargaff's rule, Adenine equals Thymine. If Adenine is 30%, Thymine must also be 30% in a double-stranded DNA.