In mRNA, what does the codon 'UAU' code for?

The codon 'UAU' in mRNA codes for the amino acid Tyrosine. Codons are composed of three nucleotides, and each specific sequence of three nucleotides corresponds to a particular amino acid or serves as a stop signal during the process of protein synthesis. In this case, when the ribosome encounters the codon 'UAU' during translation, it brings in the appropriate transfer RNA (tRNA) that carries Tyrosine, ensuring that this amino acid is incorporated into the growing polypeptide chain. This is a crucial step in the synthesis of proteins, as the sequence of amino acids ultimately determines the protein's structure and function. Understanding the genetic code and the relationship between codons and amino acids is fundamental to molecular biology and biotechnology.