推 utia:第三題為trp 03/26 16:45
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
拜託各位神人了 感恩
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