Question:

Which nitrogen base is not present in RNA?

Updated On: May 20, 2023
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Solution and Explanation

Thymine (T) is not present in RNA. Instead, RNA contains the nitrogenous base uracil (U), which is similar in structure to thymine but lacks a methyl group. Both thymine and uracil are pyrimidine bases, but thymine is found only in DNA, while uracil is found only in RNA.
In RNA, uracil pairs with adenine (A) in the complementary strand, while in DNA, thymine pairs with adenine. This base pairing allows for the formation of the double-stranded structures in both DNA and RNA.
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Concepts Used:

Nucleic acids

Nucleic acids are explained as long-chain polymeric molecules, where the monomer (the repeating unit) is referred to as the nucleotides. Thus many times nucleic acids are referred to as polynucleotides. The two main kinds of nucleic acids are-

Deoxyribonucleic Acid (DNA)

Chemically, DNA is a composition of a pentose sugar, phosphoric acid, and some cyclic bases that have nitrogen in them. DNA has β-D-2-deoxyribose in it, in the form of the sugar moiety.

Ribonucleic Acid (RNA)

The RNA molecule is a composition of phosphoric acid, a pentose sugar, and some cyclic bases containing nitrogen. The sugar moiety inside RNA molecules is β-D-ribose.