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Q.

In the DNA of an organism, which is double stranded, 30% of the bases are cytosine. The percentage of the other three bases expected to be present in this DNA are:

( A for adenine, G for guanine, T for thymine and C for cytosine).

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a

A- 30%, G- 20%, T-20%

b

A- 20%, G- 30%, T-20%

c

A- 30%, G- 30%, T-10%

d

A- 10%, G- 20%, T-30%

answer is B.

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Detailed Solution

30% of the bases are cytosine. We know that percentage of cytosine is equal to percentage of guanine. Therefore, percentage of guanine will also be 30%. 
Then, % (A+T)= 100-(30+30)= 40%
Therefore, % A= %T= 20%.

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