"the tertiary structure of the human enzyme called lysozyme is stabilized by ionic bonds between the r-groups (side chains) of amino acid subunits. which amino acid has an r-group that could form an ionic bond with the r-group of lysine? "

The tertiary structure of the proteins  is a three-dimensional structure. The polypeptides are arranged in a three-dimensional structure, which primarily arises because of the interaction between the side chains (R group) of the amino acids making up the protein.

The aspartic acid is a charged protein which is capable of forming the salt bridges. It can form ionic bonds with the R group of the other proteins. Hence, it can form ionic bond with the side chain of  the amino acid lysine.

Hence, the answer is aspartic acid.

d. making up measurements to record.

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