NEET BIOLOGY

Detailed explanation-1: -Uracil is the nitrogenous base present only in RNA, but not in DNA. Thymine is in DNA. DNA have thymine, guanine, adenine and cytosine. Thymine is replaced by uracil in RNA.

Detailed explanation-2: -One of the most important differences between DNA and RNA apart from the sugar molecule is the nitrogenous base Uracil, which is seen only in RNA. Instead of Uracil, DNA has Thymine, while the other three nitrogenous bases (Adenine, Guanine, Cytosine) are the same in both RNA and DNA.

Detailed explanation-3: -Uracil (U) is one of the four nucleotide bases in RNA, with the other three being adenine (A), cytosine (C) and guanine (G).

Detailed explanation-4: -Uracil is one of these bases. However, since mRNA is relatively short-lived and any potential faults don’t result in any lasting damage, RNA employs uracil because the instability doesn’t matter as much for RNA. Thymine is also quickly oxidized. The thymine in the nucleus is shielded from oxygen.

Detailed explanation-5: -In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).