Types of RNA: mRNA, tRNA, rRNA
Start with the big picture
mRNA carries codons that specify a protein sequence and is the only RNA type directly translated. In eukaryotes, its 5′ cap and 3′ poly-A tail support protection and translation initiation; mRNA may also undergo splicing, including alternative splicing. tRNA links codons to amino acids: its anticodon recognizes mRNA, while its 3′ CCA end binds an amino acid. Its folded structure and unusual bases are characteristic features. rRNA forms the ribosomal core and contributes catalytic activity during peptide-bond formation. The lesson compares these roles alongside RNA abundance, stability, synthesis, and the subunit composition of prokaryotic and eukaryotic ribosomes.
What you'll learn
- Distinguish the roles of mRNA, tRNA, and rRNA in protein synthesis.
- Relate mRNA caps, poly-A tails, and splicing to its structure and processing.
- Explain how tRNA’s anticodon and 3′ CCA terminus support its function.
- Describe rRNA’s structural and catalytic contributions to ribosomes.
- Compare RNA synthesis and ribosome subunit composition in prokaryotes and eukaryotes.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
