Final answer:
X is represented by the ribosome, which is responsible for assembling amino acids to form proteins based on the information provided by the mRNA molecule.
Step-by-step explanation:
X is represented by b. the ribosome.
In translation, the ribosome is responsible for assembling amino acids to form proteins based on the information provided by the mRNA molecule. The ribosome consists of two subunits, a large subunit and a small subunit, with the mRNA sitting in between them. The tRNA molecule recognizes a codon on the mRNA and binds to it by complementary base pairing, thereby adding the correct amino acid to the growing peptide chain.