Metal ion catalysis include all EXCEPT: a. increased acidity of a nucleophile with an ionizable proton. b. metal ion requirement to maintain the stable, native state of theenzyme. c metal binding weakly, perhaps only during the catalytic cycle. d. electrophilic catalysis, stabilizing the increased electron density ornegative charge that can develop during a reaction. e. all are true 16. Which statement is correct about the s-oc-s motif? a. The two s-strands are antiparellel. b. The peptide segment connecting the s-strands usually contains nomore than five amino acids. c. The peptide segment connecting the two s-strands commonlycontains proline. d. The cross-over connection itself contains an a-helical segment. e. none are correct. 18. Even though acid hydrolysis of proteins is favored over basic hydrolysis, with acid hydrolysis_________ is destroyed and must be estimated byother means. a. Lys b. Leu c. Asp d. Cys e. Trp 拜托各位神人了 感恩 --

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