A part of an mRNA molecule with the following sequence is being read by a ribosome: 5' CCG-ACG 3' (mRNA). The following charged tRNA molecules are available. Two of them can correctly match the mRNA so that a dipeptide can form. The dipeptide that will form will be _____.
A) glycine-cysteine
B) alanine-alanine
C) cysteine-alanine
D) proline-threonine
Answer: D) proline-threonine