Correct option is D
mRNA (messenger RNA) is the type of RNA that carries genetic information transcribed from DNA in the nucleus to the ribosomes in the cytoplasm, where it serves as a template for protein synthesis.
This process is part of gene expression, involving two main stages:
Transcription – DNA is transcribed into mRNA in the nucleus.
Translation – mRNA is read by ribosomes in the cytoplasm to assemble amino acids into a specific protein sequence.
Each set of three nucleotides on mRNA (called a codon) corresponds to a specific amino acid or a stop signal during protein synthesis.
• mRNA is synthesized by RNA polymerase II in eukaryotic cells.
• Ribosomes bind to mRNA to initiate translation.
• mRNA has a short life span and degrades after translation is complete.
• It is monocistronic in eukaryotes (codes for one protein) and polycistronic in prokaryotes (can code for multiple proteins).
rRNA (Ribosomal RNA) – Forms the core structure of ribosomes and catalyzes protein synthesis.
tRNA (Transfer RNA) – Brings amino acids to ribosomes during translation.
snRNA (Small nuclear RNA) – Involved in RNA splicing within the nucleus.