Question

A sample of human DNA consists of 30% adenine and 20% guanine. Which is true about the remaining nucleotide
• A DNA has 20% adenine and 30% guanine.
B DNA has 30% thymine and 20% cytosine.
•
C DNA has 20% uradil and 30% cytosine.
•
D. DNA has 30% thymine and 20% uradil.

Answer 1

Answer:

The correct answer is B) DNA has 30% thymine and 20% cytosine.

Explanation:

We use the Chargaff Law, where:

A + G = C + T (sum of pure bases A and G, is equal to pyrimidines C and T) and, A = T, C = G.

A + G = 30% + 20% =50% = C+ T

Thus:

A = 30% = T

G = 20% = C