Practice question

Polysome, also called polyribosome, describes configuration where multiple ribosomes simultaneously translate same mRNA strand arranged like beads on string visible in electron micrographs. Each ribosome decodes 5' to 3' direction synthesizing independent polypeptide chain, spaced roughly 80 nucleotides apart. Polysomes increase protein yield per transcription event without requiring additional mRNAs. In sucrose gradient profiles, heavy polysome fractions indicate active translation, light monosome fractions indicate repression, enabling studies of translational control during differentiation, stress and viral infection. This refined regulation supports accurate ribosomal assembly, quality control and translational fidelity under diverse physiological conditions and growth states.