You may have noticed in the definition of Protein that it is “composed of one or more chains of amino acids”, and Nucleic Acid is defined as “consisting of many nucleotides”. A Nucleotide is “consisting of a nucleoside”. All of these relationships, plus the more comprehensive relationship among Chemical Elements, Chemical Compounds, and Chemical Formulations, are shown in Figure 19-3. Note that the cardinality of these relationships is the reverse of what you normally would find. Where normally a parent object only may be composed of one or more children objects, here it is required. A Protein must be composed of at least one Amino Acid, or it does not exist. Similarly, a Nucleic Acid doesn’t exist if it isn’t composed of at least ...

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