First slide

The DNA

Question

If a given organism has 14% thymine in its double stranded DNA, what would be the amount of Adenine, Guanine and Cytosine respectively.

Moderate

A

14%, 36% and 36%
B

36%, 14% and 36%
C

36%, 36% and 14%
D

14%, 14% and 36%

Solution

In DNA Thymine and Adenine exist in equal proportions and Cytosine and Guanine also exist in 1:1 ratio. It Thymine is 14%, Adenine is also 14%. In the remaining 100 – 14-14 = 72%, Guanine and Cytosine exist in equal proportions i.e. 36% and 36%.

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