Where codons and anticodons are present?

Hint: We usually observe "codons" referred to on mRNA and that of "anticodons" on tRNA. Moreover, the tRNA is really the object that "contains" the codon from a theoretical point of view. tRNA is also defined as transfer RNA.

Complete answer:
1.The messenger RNA (mRNA) molecule that is developed as a result of transcription is said to harbour the codon specific for particular amino acid sequences.
2.Each tRNA molecule is chemically attached to a single, specific amino acid. They are said to have in their sequence a unique combination of three nucleotides that are aligned to the mRNA that is being translated. This pairing that occurs in between the chemical linked amino acid and the three nucleotides used for mRNA alignment are what makes the "triplet codon" present.
3.However, an anticodon is present at one end of a transfer RNA (TRNA) molecule. At the time of protein synthesis, every time an amino acid is added to the growing protein and later a tRNA forms base pairs with its complementary sequence on the mRNA molecule, making sure that the proper amino acid is added.
4.The anticodon is usually a sequence of three nucleotides on a tRNA molecule that bond to a complementary sequence on an mRNA molecule. The anticodon sequence observes the amino acid that the tRNA carries. codon- a sequence of three nucleotides on a mRNA molecule that encode a particular amino acid. Anticodons are found on molecules of tRNA.

Note: The presence of three nucleotides on an mRNA strand that encodes a specific amino acid is known as a
codon. Out of all 64 codons present only 61 codons that code for amino acids and 3 codons do not code for any amino acids, hence they are known as stop codons. The codon is unambiguous and has its own identity and specific means one codon can code for only one amino acid.