Translation involves several different types of trna molecules. which statement best describes how trna molecules assemble amino acids into a polypeptide?

a. one trna molecule assembles the polypeptide, and the others assist it.
b. three trna molecules assemble the polypeptide, and the others assist them.
c. each trna molecules assembles a different part of the polypeptide, and all at the same time.
d. the different trna molecules act in a specific order, one after the other like an assembly line.

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