Practice question

Leader peptide consists of only fourteen amino acids encoded within first fifty codons of 162-nucleotide leader transcript located upstream of attenuator hairpins and structural genes. Short length ensures translating ribosome remains physically close to transcribing RNA polymerase, maintaining one-to-one coupling necessary for attenuation mechanism to function responsively. Despite brevity, sequence includes Trp-rich sensing codons plus translation termination signal for controlled ribosome release. Approximate length of fourteen residues balances minimal translational cost and rapid synthesis with sufficient coding capacity to embed critical regulatory tryptophan codons and still allow formation of four complementary RNA regions controlling termination versus readthrough choice.