Final answer:
The unit of DNA that specifies a certain amino acid is called a codon, the same unit of mRNA is called a(n) codon which, during protein synthesis, is matched by the anticodon of tRNA.
Step-by-step explanation:
The unit of DNA that specifies a certain amino acid is called a codon, the same unit of mRNA is called a(n) codon which, during protein synthesis, is matched by the anticodon of tRNA.