Question

what is the function of the structure labeled 3? a set of instructions the ribosome uses to build proteins delivers amino acids to the ribosome represents an elongating chain of amino acids attaches amino acids together to build proteins

Explanation:

The structure labeled 3 in the image (assuming it is the t - RNA like structure) is responsible for delivering amino acids to the ribosome. In protein synthesis, transfer RNA (t - RNA) has an anticodon that pairs with the codon on messenger RNA (mRNA) and carries the corresponding amino acid to the ribosome for protein assembly.

Answer:

delivers amino acids to the ribosome