The triprotic form of the amino acid cysteine is shown below, along with the pK, value for each ionizable site. The isoelectric point (pl) for cysteine occurs at pH- 5.1. B 10.8 *Hy CH- CH₂ SH CB A LA OH (1) What is the charge on the molecule at the isoelectric point? (2) In the predominant form of the molecule at the isoelectric point, is each of the sites (labeled A, B, and C) protonated or unprotonated? site A site B: site C

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