Question

Which RNA carries information from DNA in protein synthesis?
A. snRNA
B. tRNA
C. rRNA
D. mRNA

Answer 1

Hint: Protein synthesis can be defined as the process by which proteins are synthesized. It occurs in two stages - transcription and translation and involves DNA.

Complete Answer:
Option A: snRNA are transcribed by either RNA polymerase II or RNA polymerase III and their primary function is in the processing of the hnRNA or pre-messenger RNA in the nucleus. Therefore, this is the incorrect option.

Option B: tRNA or Transfer RNA is an RNA molecule which helps in decoding of the messenger RNA or mRNA sequence into a protein. It is also functional at specific sites of the ribosomes during translation which is a process through which proteins are synthesized from an mRNA molecule.

Option C: rRNA or Ribosomal RNA is a ribozyme which helps in carrying out protein synthesis in ribosomes. It is transcribed from DNA and then it is bound to the ribosomal proteins which later forms the small and large ribosome subunits.

Option D: mRNA or messenger RNA is involved in carrying the protein from a cell’s DNA to the ribosome, which are the machines which drive protein synthesis. Therefore, this is the correct option.

Thus, the correct option is D) mRNA.

Note: The importance of protein synthesis is that,
- It helps in production of proteins which are in turn responsible for all cell function and structure.
- There are three steps: Translation, elongatio and translation.
- DNA is the primary genetic material in protein synthesis and is used to create proteins in protein synthesis.