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.
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C DNA has 20% uradil and 30% cytosine.
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D. DNA has 30% thymine and 20% uradil.

Answer 1

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

Step-by-step 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