Here's why:

* mRNA (messenger RNA): This type of RNA carries genetic information from DNA in the nucleus to the ribosomes, where proteins are synthesized.

* Codon: A codon is a sequence of three nucleotides (bases) on mRNA that specifies a particular amino acid.

Example: The mRNA codon "AUG" codes for the amino acid methionine, which is also the start codon for protein synthesis.

Let me know if you'd like to explore any other aspects of genetics or molecular biology!