Question

5-methyl uracil is?
A. Nitrogenous base found in RNA.
B. Nitrogenous base in DNA
C. The special type of tRNA
D. Mutagen

Answer 1

Hint: DNA or deoxyribonucleic acid comprises two polynucleotide chains in coiled formation. Each polynucleotide chain possesses nucleotide monomers. These monomers form a chain by the covalent bonds. The nucleotide is composed of phosphate and nucleoside. Nucleoside comprises a nitrogenous base and a five-carbon sugar molecule.

Complete answer: The nitrogenous base of RNA: RNA is composed of ribonucleotides. Each ribonucleotide comprises a phosphate group, nitrogenous base, and ribose sugar. The nitrogenous base of the RNA involves purine and pyrimidine. Purine involves adenine and guanine and pyrimidine involves uracil and cytosine.
The nitrogenous base of DNA: DNA or Deoxyribonucleic acid comprises two types of nitrogenous bases. These are purine and pyrimidine. Purine involves adenine and guanine. Pyrimidine includes thymine and cytosine. 5-methyl uracil is another name of thymine.
The special type of tRNA: tRNA is a type of RNA that acts as the adaptor molecules. tRNA is involved in the synthesis of protein by the ribosomes. It comprises 70-90 nucleotides.
Mutagen: The agents which are involved in changing the genetic material by causing the mutation. Mutation involves changing or altering or deletion of DNA sequences. There are three types of mutagens found. These are physical mutagen, chemical mutagen, and biological mutagen.
So, the correct answer is “Option A”.

Note: There is a basic difference that occurs between the nitrogenous base of the RNA and the DNA.RNA possesses uracil while DNA comprises thymine as the pyrimidine base. Methylation at the 5th carbon position of the uracil derives thymine. Thus the thymine is known as the 5 methyl uracil.