Another chemical name for thymine is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 5-methyl uracil
DNA has the base thymine. In RNA, the base uracil is found in its place. Thymine is uracil with an extra methyl group (-CH3) on carbon 5 of the ring, so its other chemical name is 5-methyl uracil.
(1) 5-methyl uracil — Correct. The methyl group sits at position 5.
(2), (3), (4) 6-methyl uracil, 3-methyl uracil and 2-methyl uracil — Incorrect. These put the methyl group at other positions of the ring. They are not names of thymine.
NCERT Extract:
Structure of Polynucleotide Chain – …
