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BIO NMDCAT Ribonucleic acid (RNA)
nmdcat.online July 3, 2026

76. The macromolecule responsible for holding the growing polypeptide chain during the translation process is the

A. tRNA bound at the P site
✓
B. mRNA bound at the shine-dalgarno sequence
C. tRNA bound at the E site
D. Free rRNA inside the nucleolus

📝 Explanation

The P (peptidyl) site retains the tRNA molecule attached to the evolving polypeptide chain before transferring it to the incoming A-site tRNA.

📖 Additional Information

  • tRNA bound at the P site
  • mRNA bound at the shine-dalgarno sequence
  • tRNA bound at the E site
  • Free rRNA inside the nucleolus

The P (peptidyl) site retains the tRNA molecule attached to the evolving polypeptide chain before transferring it to the incoming A-site tRNA.

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