Question

7. Which of the following nucleotides is not present in RNA?
O AMP
GMP
O CMP
TMP​

Answer 1

Answer:

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Answer 2

The nucleotide not present in RNA is (d) TMP.

(d) TMP- correct option

• Ribosomes are the components that carry genetic information from DNA to the RNA's nucleotides, which play a crucial function as a messenger in the process.
• With a few structural exceptions—DNA is a double-stranded nucleic acid, whereas RNA is a single strand—RNA and DNA are, in general, highly similar.
• Deoxyribonucleic acid, or DNA, is composed of nucleotides like adenine, thymine, cytosine, and guanine and has a phosphate bone.
• Contrarily, RNA has ribonucleic acid and a phosphate backbone, and its nucleotides are almost identical to those of DNA, with the exception of thymine, where uracil stands in for RNA.
• Hence, this is the correct option as instead of TMP, UMP is present in RNA.

(a) AMP- incorrect option

• Adenosine monophosphate, one of the four nucleobases, is composed of the nucleobase Adenine, a phosphate group, and the sugar ribose pentose.
• As a Purine base, the adenine in AMP forms hydrogenous double bonds with the uracil in UMP, increasing stability.
• The poly A tail of RNA is made up of numerous Adenine residues thanks to the adenine in AMP.
• Hence, this option is incorrect.

(b) GMP- incorrect option

• One of the four nucleotides that make up the structure of RNA is guanosine monophosphate, which normally contains a phosphate group, a five-carbon ribose sugar, and the nucleobase Guanine.
• A purine base, guanine forms hydrogenous triple bonds with CMP molecules.
• It is a crucial monomer in the structure of RNA.
• A modified GMP or guanine sequence creates the 5-prime cap at the 5-prime end of RNA, which is necessary to preserve the nucleic acid and facilitate RNA processing and translation.
• Hence, this option is incorrect.

(c) CMP- incorrect option

• Cytidine monophosphate is another fundamental monomeric component of RNA.
• There are three parts to it: a phosphate group, a ribose sugar, and the nucleobase cytosine. Cytosine, a pyrimidine base, forms hydrogenous triple bonds with GMP's guanine to form a pair.
• CMP plays a crucial part in signal transduction.
• Hence, this option is incorrect.

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