Question

Which is the largest?
A) tRNA
B) rRNA
C) mRNA
D) Both B and C

Answer 1

tRNA- It is a transfer ribonucleic acid that decode a messenger RNA sequence into a protein and participates in protein synthesis.rRNA- Ribosomal RNA associates with a set of proteins to form ribosomes.mRNA- A single stranded molecule carries genetic code from DNA.

Complete answer:
Ribonucleic acid is a polymeric molecule necessary biologically for the roles of coding, decoding, regulation and expression of genes. RNA consists of ribose sugar, with carbons numbered 1’ through 5’. The bases which are attached to ‘1’ position are adenine, cytosine, guanine, uracil. At 3’ position a phosphate group is attached to one ribose and at 5’ position of the next ribose.
The three types of RNA are:-
Messenger RNA: It helps in transcription of genetic code from DNA into a form that is used to build proteins. mRNA carries genetic information from nucleus to cytoplasm.
Ribosomal RNA or rRNA: It is located in the cytoplasm where the ribosome is found. It helps in translation of mRNA into proteins.
Transfer RNA or tRNA: It is located in the cytoplasm to help in protein synthesis. It brings amino acids to the ribosomes which further join together and make polypeptides as well as proteins.
The mRNA has a complete nucleotide sequence so it is considered as the largest RNA.

Hence the correct answer is option ‘C’ mRNA.

Note: The mRNA is formed during the process of transcription, where an enzyme called RNA polymerase converts the gene into primary transcript mRNA which is referred as pre-mRNA. The mature mRNA is read by the ribosome and utilizes amino acids carried by tRNA.