Protein synthesis proceeds by the ribosome
A)alternating between many chains.
B)moving three nucleotides at a time on the mRNA.
C)attaching amino acids in a random fashion.
D)selecting the tRNA molecule that fits.
E)attaching amino acids to the growing chain without charged tRNAs.

Question

Quizplus · Accepted Answer

The ribosome moves three nucleotides at a time on the mRNA, which is called a codon. Each codon corresponds to a specific amino acid, and the ribosome selects the appropriate transfer RNA (tRNA) molecule with the complementary anticodon to bring in the amino acid. The ribosome then attaches the amino acid to the growing polypeptide chain. This process continues until the ribosome reaches a stop codon on the mRNA. Therefore, option B is the correct answer.

Protein Synthesis Proceeds by the Ribosome