DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

hydrogen bonds between the pair of bases
ionic bonds between the pair of bases
covalent bonds between the pair of bases
None of these

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DNA Structure and Replication
In DNA, there are

five bases known as adenine, guanine, thymine, tryptophan and cytosine
only two bases known as adenine and cytosine
three bases known as adenine, guanine and cytosine
four bases known as adenine, guanine, thymine and cytosine

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