Q.

Length of the DNA is 510 angstroms. Find the percentage of cytosine. Assume the number of adenine bases is 30 in that DNA.

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answer is 4.

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Detailed Solution

Pitch of the DNA is 34 angstroms.Number of turns in the DNA= 510/34= 15 turnsNo. of base pairs per turn = 10bpNo. of base pairs in 15 turns- 15 X10= 150bpNo. of adenine = 30= No. of thymineTotal no. of (A+T) = 30+30= 60Total no. G+C= 300-60= 240No. of C= 240/2=120% C= (120/300) X 100= 40%.
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