The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is_______.
$5^{'}$ - G - G-C-A-A-A-T-C-G-G-C-T-A-3'

Question

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is_______. 5 ′ - G - G-C-A-A-A-T-C-G-G-C-T-A-3'

TestHub · Accepted Answer

Two nucleic acid chains are wound about each other and held together by H bonds between pair of bases.
Adenine from two hydrogen bonds with thymine and Guanine form three hydrogen bond with cytosine.
$5^{'} G - G - C - A - A - A - T - C - G - G - C - T - A - 3^{'}$
In given DNA strand total seven guanine and cytosine bases which form total 21 H -bonds and six adenine and thymine base which will form total 12 H-bonds with other DNA strand.
Total no. of H bonds $= 7 \times 3 + 6 \times 2 = 33$

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