Question

proteins are produced by linking together chains of ______ which are delivered by trna molecules.
a. nucleotides
b. amino acids
(there are also two crossed-out options: c. fatty acids, d. monosaccharides)

Explanation:

Proteins are biological polymers. Their monomer building blocks are amino acids, which are transported to ribosomes by tRNA molecules during protein synthesis. Nucleotides form nucleic acids, fatty acids are components of lipids, and monosaccharides form carbohydrates.

Answer:

B. amino acids