Final answer:
Anticodons are sequences of three nucleotides found on tRNA molecules, and they are complementary to codons on mRNA, being crucial for proper protein synthesis.
Step-by-step explanation:
Anticodons are found on tRNA molecules. Transfer RNA (tRNA) is essential in reading the information encoded in the mRNA and transfers the appropriate amino acid to the growing polypeptide chain during protein synthesis. The anticodon is a consecutive sequence of three nucleotides on a tRNA molecule that is complementary to a specific codon on an mRNA molecule. Each tRNA wields an anticodon able to base pair with its corresponding mRNA codon, facilitating the addition of its amino acid to the polypeptide chain.