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DNA molecule has length of 476A° with 20% Guanosine. Choose the correct features of DNA

I) 56 cytosine II) 336 Hydrogen bonds

III) Total 150 nucleotides IV) 84 thymine

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I, II, III

I, II, IV

II, III, IV

I, III, IV

answer is B.

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Detailed Solution

Given that the length of the DNA molecule is 476A° with 20% Guanosine. The pitch of DNA is 34 $\overset{0}{A}$ .

No. of turns = 476/34= 14 turns.

1 turn has 10 bp. Therefore, 14 turns has 140 bp.

Total no. of nucleotides = 140*2 = 280

No. of guanine is 280*0.2= 56

No. of guanine = No. of cytosine =56

No. of A+T = 280-(56+56)= 168

No. of A = No. of T= 168/2= 84

Total no. of hydrogen bonds = (84*2)+(56*3)= 336

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