A) three hydrogen bonds
B) phosphate bond
C) two hydrogen bonds
D) covalent bond
Correct Answer: A
Solution :
DNA helix has two types of nitrogenous bases (1) Purines and (2) Pyrimidines .The Purines are adenine and guanine, while the Pyrimidine are thymine and cytosine. Adenine always paired with thymine by two hydrogen bonds while guanine always paired with cytosine by three hydrogen bonds.
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