A) nitrogenous bases are bonded covalently to phosphate groups
B) pentose sugars are bonded ionically to the nitrogenous bases
C) pentose sugars are bonded by hydrogen bonds to the nitrogenous bases
D) nitrogenous bases are bonded to each other by hydrogen bonds
Correct Answer: D
Solution :
Linkage between thymine and adenine of opposite strands consists of 2 hydrogen bonds (T = A), whereas the linkage between guanine and cytosine consists of 3 hydrogen bonds (G = C)
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