Question

What would be the percentage of thymine (T) and cytosine (C) in a molecule of DNA composed of approximately 16.2% adenine (A) and 33.4% guanine (G)?

• A. 16.3% T and 16.3% C
• B. 34.1% T and 34.1% C
• C. 34.1% T and 16.3% C
• D. 16.3% T and 34.1% C
• E. 33.4% T and 16.2% C

Answer 1

The correct option is D 16.3% T and 34.1% C

The purine adenine (A) always pairs with the pyrimidine thymine (T) and the pyrimidine cytosine (C) always pairs with the purine guanine (G). These base pair relationships are often called Chargaff's rules of DNA base pairing.

As, A = T and C = G, hence answer is '16.3% T and 34.1% C'