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Module 10 Set 7

QuestionAnswer
rate increases as [substrate] increases
no further increase occurs after all enzyme molecules are saturated with substrate
Km: substrate concentration req'd by enzyme to operate at half its maximum velocity
Km: affinity of enzyme to substrate
lower Km higher rate/ affinity
Vmax: rate of product formation when enzyme is saturated with the substrate operating as fast as possible
each enzyme has specific pH and temperature optima
denaturation: loss of enzyme’s structure and activity when temperature and pH rises too much above optima
usually optimum temperature is close to maximum temperature
enzyme production MUST be controlled in cells
noncompetitive inhibitor binds enzyme at site other than active site; changes enzyme’s shape so that it becomes less active
competitive inhibitor directly competes with binding of substrate to active site
you can overcome inhibition by adding more substrate
Thomas Cech and Sidney Altman discovered some RNA molecules also can catalyze reactions
Examples of splicing ribozymes catalyze peptide bond formation; self-splicing; and involved in self-replication
Created by: Whereis_raye