Question

What is the name of the nucleotide base substitute for thymine in DNA transcription and what is its purpose?

Answer 1

Uracil, to make the mRNA strand easily destroyed after use.

Step-by-step explanation:

The presence of uracil enables mRNA to be easily destroyed after the mRNA sequence was read and used by molecular workers to make and assemble amino acids into proteins.

Answer 2

In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3). This means that during elongation, the presence of adenine in the DNA template strand tells RNA polymerase to attach a uracil in the corresponding area of the growing RNA strand (Figure 4).

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