Practice question

Polysome formation substantially increases translational efficiency by enabling parallel synthesis of many polypeptide copies from single mRNA transcript. After first ribosome initiates and moves downstream, subsequent ribosomes load at 5' cap and begin elongation, creating queue. This multiplies output per mRNA lifetime, economizes transcriptional resources, allows rapid bursts of protein production upon stimulus. Regulation of polysome assembly via initiation factors controls global protein synthesis. Polysome profiling discriminates highly translated mRNAs in dense fractions versus translationally stalled monosomes, crucial diagnostic for cellular physiology and stress adaptation.