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Module 10 Set 7
| Question | Answer |
|---|---|
| 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 |
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Whereis_raye