The two strands in double stranded helix structure for DNA are said to be complementary to each other because

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The two strands in double stranded helix structure for DNA are said to be complementary to each other because

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both of them are nucleic acid chains

they form hydrogen bonds between their bases

the hydrogen bonds between the two strands are always between the specific pairs of bases

they form covalent bonds between their bases

answer is C.

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Detailed Solution

The double strands of DNA are joined together through hydrogen bonding which takes place between nitrogenous bases. There two strands are complementary because the base present in one stand form hydrogen bonding with its partner present in other strand.

Adenine forms two H-bonds with thymine and guanine forms three H-bonds with cytosine.

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