Question

Which of the following RNAs should be most abundant in animal cell?

• A. r-RNA
• B. t-RNA
• C. m-RNA
• D. mi-RNA

Answer 1

The correct option is A r-RNA

RNA stands for ribonucleic acid. It is a polynucleotide chain made of many 5-C compound ribose sugars, phosphates and nitrogenous bases (purines and pyrimidines).

There are different types and forms of RNA like r-RNA, m-RNA, t-RNA, miRNAs, etc.

r-RNA: stands for ribosomal RNA, constitutes 80% of total RNA. It is a constituent of ribosomes.

m-RNA: stands for messenger RNA, constitutes 3 to 5% of total RNA. It carries information from DNA in the form of codons for protein synthesis. Three consecutive nucleotides in mRNA constitute a codon which codes for a particular amino acid.

t-RNA: stands for transfer RNA, constitutes 10 to 15% of total RNA. It brings amino acids from cytoplasm for protein synthesis.

miRNA: stands for microRNAs, these are non-coding RNAs that play an important role in regulating gene expression.

Therefore, the ribosomal RNAs (rRNAs) are the most abundant RNAs in animal cells.