A) uracil
B) 5-methyl uracil
C) guanine
D) \[N{{H}_{4}}Cl\]
Correct Answer: B
Solution :
: Four nitrogen bases present in DNA are adenine, guanine, cytosine and thymine (=5-methyl uracil). Thymine is present only in DNA and is absent in RNA, as in RNA, uracil is present in place of thymine.
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