RNAProtein160-page6

RNAProtein160-page6 - other, so the tRNA triplet that codes...

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Gene Expression – DNA to Protein - 6 When you look at Codon tables, you will see that some amino acids are coded for by more than one codon. Often, only the first two nucleotides of the triplet are essential; the third is redundant. (e.g., CCU, CCC, CCA and CCG all code for the amino acid, proline, and UCU, UCC, UCA and UCG all code for the amino acid, serine.) The ability of amino acids to bond to more than one RNA triplet is known as the "wobble effect". The reverse is not true. One codon can never code for more than one specific amino acid. UCU codes for serine. UCU can never code for any other amino acid. The process of translation requires tRNA molecules that have triplet RNA sequences that match (complement) the mRNA for the amino acid assembly. The only way to match nucleotides is by base pairs that are complements to each
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Unformatted text preview: other, so the tRNA triplet that codes for and attaches to a specific amino acid is often called the anticodon. Each tRNA has an amino acid binding site that can attach to its specific amino acid. Specific enzymes do this. These attachment sites are also phosphorylated (using ATP) to provide the energy for protein synthesis. Overview of DNA-mRNA-tRNA and amino acids relationship (The tRNAs attached to amino acids are not shown on the left diagram) Codon-anticodon (mRNA-tRNA) matches occur at ribosomes where the amino acids, which are attached to the tRNA molecules, can be joined by peptide bonds to form polypeptides. Several ribosomes can function at one time so that several copies of a polypeptide can be made simultaneously....
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