If a double-stranded DNA has 20% cytosine. What will be the percentage of adenine in it?

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40%

30%

20%

60%

answer is C.

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Detailed Solution

Concept: DNA is composed of nitrogenous bases, they are adenine (A), guanine (G), thymine (T), and cytosine (C). These nitrogen bases are in pairs, i.e., Adenine : Thyamine and Guanine : Cytosine.

According to the given information, the DNA strand has 20% of cytosine.
- As we know nitrogen bases are in pairs (Adenine : Thyamine and Guanine : Cytosine). So, 20 % cytosine accounts for 20% guanine.
- This implies C+ G = 40%.
- The left-out percentage is 60%.
-In this way, the excess rate must be partitioned equally among the remaining two nitrogen bases.
-A + T = 60% (Adenine = 30% and Thyamine = 30%).

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