Explanation:
The incorrectly matched pair is option 'D' - Anticodons - RNA.

Anticodons are the three nucleotide sequences found on transfer RNA (tRNA) molecules that are complementary to the codons on mRNA during translation. They play a crucial role in bringing the correct amino acids to the ribosomes for protein synthesis.

RNA (ribonucleic acid) is a nucleic acid that is involved in various cellular processes, including protein synthesis. It is transcribed from DNA and acts as a messenger between DNA and protein synthesis.

The given pair is incorrect because anticodons are not RNA themselves, but rather they are found on the tRNA molecules, which are made up of RNA. Therefore, it would be more accurate to say that anticodons are part of tRNA rather than RNA itself.

Correct pairings:
a) Initiation codons - AUG, GUG
- The initiation codons are specific nucleotide sequences found in mRNA that signal the start of protein synthesis. AUG is the most common initiation codon and codes for the amino acid methionine. GUG is a less common initiation codon that also codes for methionine in some organisms.

b) Stop codons - UAA, UAG, UGA
- Stop codons are nucleotide sequences found in mRNA that signal the termination of protein synthesis. When a ribosome encounters a stop codon, it releases the newly synthesized protein and disassembles. UAA, UAG, and UGA are the three stop codons in the standard genetic code.

c) Methionine - AUG
- Methionine is an amino acid that serves as the starting point for protein synthesis. In the genetic code, the codon AUG codes for methionine and also serves as the most common initiation codon.

In summary, the incorrectly matched pair is option 'D' - Anticodons - RNA. Anticodons are not RNA themselves but are found on tRNA molecules, which are made up of RNA.