In some proteins, an ionic bond may form between an amino acid with
A. a glycine and another with a tryptophan.
B. a carboxyl group and an amino acid with a C-terminal.
C. a positive R group and an amino acid with a negative R group.
D. a negative R group and a nonpolar amino acid.
E. a sulfhydryl group and an amino acid with an amine group.
Answer: C
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