The base pairing rule for DNA is adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). When RNA copies the DNA, the base pair for adenine changes to instead of thymine.

Question 5 options:

Thymine

Uracil

There is no new base

U.. Something Or Another...

Uracil

Explanation:

DNA molecule is made up of monomeric nucleotides, which are of four different types viz: Adenine, Guanine, Cytosine, and Thymine. According to the COMPLEMENTARY BASE PAIRING RULE as proposed by Chargaff, these nucleotides pair in the DNA as follows: Adenine to Thymine (A-T), Guanine to Cytosine (G-C).

However, in the RNA molecule (second nucleic acid), a fifth nucleotide called URACIL is found. This URACIL replaces thymine because thymine is only found in DNA while Uracil is only found in RNA. When DNA is transcribed into mRNA, Adenine nucleotide gets transcribed into Uracil in the RNA instead of thymine i.e A to U.

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