There are only four DNA bases, but there are 20 amino acids that can be used for proteins. So, groups of three nucleotides form a word (codon) that specifies which of the 20 amino acids goes into the protein (a 3-base codon yields 64 possible patterns (4*4*4), which is more than enough to specify 20 amino acids.pecifically, the order of nucleotides within a gene specifies the order and types of amino acids that must be put together to make a protein. A protein is made of a long chain of chemicals called amino acids Proteins have many functions: 1  Enzymes that carry out chemical reactions (such as digestive enzymes).
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The most frequently used paper size is A4 measuring 210 by 297 millimetres (8.27 in Ã 11.7 in). The significant advantage of this system is its scaling: if a sheet with an aspect ratio of â2 is divided into two equal halves parallel to its shortest sides, then the halves will again have an aspect ratio of â2.