In order to find the amino acid sequence given mRNA, you first need to know what mRNA is. mRNA is a molecule that helps carry the genetic instructions of a gene from the DNA to the site of protein synthesis. The nucleotide sequence of a gene contains the information necessary to build a specific protein. This information is transcribed into mRNA, which is then translated into protein.
mRNA consists of four different nucleotides: adenine (A), uracil (U), cytosine (C), and guanine (G). These nucleotides are arranged in triplets, called codons, that each correspond to a particular amino acid. For example, the codon AAA corresponds to the amino acid lysine, while UUU corresponds to phenylalanine. The order of these codons determines the sequence of amino acids in a protein.
To find the amino acid sequence given mRNA, you must first identify the start codon and then read through the sequence until you reach a stop codon. The start codon is always AUG, which codes for methionine. Stop codons are UAA, UAG, and UGA; these do not code for any amino acids and signal the end of translation. Once you have identified all of the codons in between the start and stop Codons inclusive ,you can determine which amino acids they correspond to and thus assemble the complete aminoacid sequence .