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
four bases known as adenine, guanine, thymine and cytosine
three bases known as adenine, guanine and cytosine

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DNA Structure and Replication
In DNA, nucleotides are covalently joined together by

3', 4' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 3' phosphodiester bonds to form a repetitive sugar-phosphate chain
3', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain
2', 5' phosphodiester bonds to form a repetitive sugar-phosphate chain

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