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Complimentary base pairing

Complimentary base pairing - Codons One strand of DNA(the...

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Complimentary base pairing The adenine of one strand is always hydrogen-bonded to a thymine on the other. Similarly, Guanine is always paired with Cytosine. A-T G-C Antiparallel The end of a single strand that has the phosphate group is called the 5’ end. The other end is the 3’ end. The two strands of a DNA molecule run in opposite directions. Note the 5’ and 3’ ends of each strand in the diagram. RNA RNA (ribonucleic acid) is similar to DNA and is involved in the synthesis of polypeptides and proteins as discussed above. The table below lists differences between DNA and RNA. DNA RNA # Strands 2 1 (see diagram below) Sugar deoxyribose ribose Bases A, T, G, C A, U, G, C RNA is single-stranded as shown below.
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Unformatted text preview: Codons One strand of DNA (the anti-sense strand) is used as a template to produce a single strand of mRNA. The bases in the mRNA strand are opposite (complimentary) to the bases in the DNA template strand; it resembles the sense strand of DNA except that the base thymine is 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....
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