Protein is composed of amino acids which are in turn made up of mostly carbon hydrogen oxygen and nitrogen a few amino acids also contain sulfur both cysteine and methionine. How are proteins made to make a protein a cell must put a chain of amino acids together in the right order first it makes a copy of the relevant dna instruction in the cell nucleus and takes it into the cytoplasm a bit like taking a photocopy of the instruction manual from the managers office out to the assembly lines in a car factory. Proteins are made up of hundreds or thousands of smaller units called amino acids which are attached to one another in long chains there are 20 different types of amino acids that can be combined to make a protein the sequence of amino acids determines each proteins unique 3 dimensional structure and its specific function. In a cell proteins are made in the cells ribosomes ribosomes string together long chains of amino acids to synthesize proteins the mrna messenger ribonucleic acid trna transfer ribonucleic acid and the amino acids work together to form proteins
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