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Unformatted text preview: replaced by uracil. The mRNA contains three-letter (three-base) codes used to determine the sequence of amino acids in the polypeptide that it codes for. For example, in the diagram below, GUG is the code for valine. The sequence of codes in DNA therefore determines the sequence of amino acids in the protein. Each three-letter code in mRNA is a codon . It is the code for one amino acid. Click here for details on how information is stored in DNA. ATP ATP (adenosine triphosphate) is a nucleotide that is used in energetic reactions for temporary energy storage . Energy is stored in the phosphate bonds of ATP. When ATP breaks down to form ADP and P i , energy is released. Normally, cells use the energy stored in ATP by breaking one of the phosphate bonds, producing ADP. Energy is required to convert ADP + P i back to ATP. ATP is continually produced and consumed as illustrated below....
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- Fall '10