Answer:
Codons
Step-by-step explanation:
Codon is a group of three nucleotides in the mRNA molecule that specifies a particular amino acid. During gene expression, the nucleotide information in a gene is transcribed into an mRNA molecule. The mRNA strand is read in a group of triplet nucleotides called CODON.
Each codon specifies or codes for a specific amino acid during translation process. UUU and UUG are both examples of CODONS that correspond to the amino phenylalanine in the genetic code.