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Downstream means near the 3' end so notice that the first codon us not methionine. What is the correct amino acid sequence?

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Final answer:

To determine the correct amino acid sequence, we use a genetic code chart to translate mRNA codons. Given an mRNA sequence, each triplet codon is translated into an amino acid, starting from the 5' end and ending at a stop codon. Methionine is often the start amino acid.

Step-by-step explanation:

The question revolves around the process of translating mRNA into an amino acid sequence, which is a fundamental concept in molecular biology, specifically in the area of gene expression and protein synthesis. To determine the correct sequence, one must use a genetic code chart to translate each codon into its corresponding amino acid. For example, given the mRNA sequence 5'-AUGCUGAAUUGCGUAGGA-3', the corresponding amino acids would be methionine (AUG), leucine (CUG), asparagine (AAU), alanine (UGCG), and the sequence would terminate at the stop codon (UAG), resulting in the sequence Met-Leu-Asn-Ala. The sequences are read from the 5' to the 3' end and protein synthesis starts with the N-terminal amino acid, which in this case is methionine, typically the initiation amino acid for protein synthesis, although it is often removed in further processing steps.

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