BotanyCalculate the number of hydrogen bonds in DNA molecule 1156 Ǻ length and containing 80 cytosine residues.

Calculate the number of hydrogen bonds in DNA molecule 1156 Ǻ length and containing 80 cytosine residues.

  1. A

    650

  2. B

    760

  3. C

    860

  4. D

    900

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    Solution:

    Pitch of the DNA is 34 angstrom.
    Number of turns in the DNA= 1156/34= 34 turns
    No. of base pairs per turn = 10bp
    No. of base pairs in 34 turns- 34*10= 340bp
    No. of cytosine = 80= No. of guanine
    Total no. of (G+C)= 160
    Total no. of (A+T) = 680-160= 520
    No. of A= 520/2= 260
    No. of hydrogen bonds= (260*2)+(80*3)= 760

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