Question

question 21 of 25
what is the final step in translation?
a. the new strand of mrna leaves the nucleus.
b. an amino acid is added to a polypeptide chain.
c. the ribosome releases the mrna after reaching a stop codon.
d. a trna molecule binds to the ribosome.

Explanation:

Translation has three main stages: initiation, elongation, and termination. When a stop codon (UAA, UAG, or UGA) is reached during translation, it signals the termination of the process. Release factors bind to the stop codon, and the ribosome then releases the mRNA, along with the newly - synthesized polypeptide chain.

• Option A is part of transcription (mRNA leaving the nucleus) rather than translation.
• Option B is part of the elongation stage of translation, not the final step.
• Option D is part of the elongation stage (tRNA binding to the ribosome to add amino acids).

Answer:

C. The ribosome releases the mRNA after reaching a stop codon.