Translation and Protein Biosynthesis
Start with the big picture
Ribosomes read mRNA in the 5′ to 3′ direction while building a polypeptide from its N-terminus to its C-terminus. Translation proceeds through initiation, elongation, and termination, with tRNAs matching codons and ribosomal RNA catalyzing peptide-bond formation. The lesson distinguishes key features of eukaryotic and prokaryotic ribosomes and start-site recognition, and explains the A, P, and E sites, wobble pairing, and the role of GTP. It also introduces polysomes, energy use, protein folding and post-translational modifications, and signal peptide–mediated targeting. These connected concepts provide a foundation for understanding translation regulation, quality control, and the actions of translation inhibitors.
What you'll learn
- Describe translation direction and the roles of mRNA, ribosomes, and tRNA.
- Compare eukaryotic and prokaryotic ribosome subunits and start-site recognition.
- Outline initiation, elongation, and termination, including ribosomal sites and release factors.
- Explain tRNA charging, wobble pairing, polysomes, and the energy demands of translation.
- Recognize how folding, modifications, and signal peptides shape protein processing and targeting.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
