Thursday, July 30, 2009

How does the genetic coding rule predict the sequence of amino acids from a sequence of codons in mRNA?

Help please

How does the genetic coding rule predict the sequence of amino acids from a sequence of codons in mRNA?
The base paring DNA is AUGC because U replaces T
Reply:The codons inthe mRNA come for amino acids which create the poly peptide chain also known as protiens.
Reply:Translation from mRNA to protein begins with the start codon AUG (for methionine). From there, another amino acid is added for every 3 bases according to the genetic code until a stop codon is reached. Transfer RNA (tRNA) is used as the intermediate between mRNA and amino acids. On one end of the tRNA is the reverse complement to a specific codon, and on the other is the corresponding amino acid. For example, the tRNA for methionine would have the 5' to 3' sequence CAU to bind with the AUG codon.
Reply:The mRNA strand contains numerous nucleotides that encode for one of four bases (A, U, G, C). Thymine is only contained with dexoyribose nucleic acid, DNA. So as the nucleotides are fed through the ribosomes, each triplet of nucleotides encodes for one amino acid (one codon). The amino acids then form polypeptides which are essentially proteins.


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