Final answer:
The correct answer is a) Codon, which is the three-base sequence on mRNA that binds to a complementary anticodon on a tRNA molecule during translation.
Step-by-step explanation:
The three-base sequence in mRNA that binds to a tRNA molecule is known as a codon. The mRNA codon is specifically designed to match with the complementary anticodon on the tRNA. During the process of translation, each codon corresponds to a specific amino acid. When the mRNA is read by the ribosome, the anticodons of tRNA molecules pair with the appropriate codons on the mRNA, thus aligning the amino acids in the correct sequence to form a protein. The anticodon is a three-nucleotide sequence on the tRNA that is complementary to the codon on the mRNA, ensuring that the correct amino acid is added to the growing polypeptide chain.