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Module 10 Set 6
| Question | Answer |
|---|---|
| apoenzyme | protein component of an enzyme |
| cofactor | nonprotein component of an enzyme |
| prosthetic group | firmly attached |
| coenzyme | loosely attached |
| holoenzyme | apoenzyme + cofactor |
| a typical exergonic reaction | A + B → ABt → C + D |
| transition-state complex | resembles both the substrates and the products |
| enzyme speeds up reaction by | lowering Ea |
| activation energy | energy required to form transition-state complex |
| lock-and-key model: | only the substrate (key) fits into the active site (key hole) of the enzyme (lock) |
| induced-fit model: | only the proper substrate is capable of inducing the proper alignment of the active site for the enzyme to perform its catalytic function |
| how enzymes lower Ea: By increasing | concentrations of substrates at active site of enzyme |
| how enzymes lower Ea: By orienting substrates | properly with respect to each other in order to form the transition-state complex |
| isoenzymes | different enzymes that catalyze same reaction |
| each end product regulates the initial | pacemaker enzyme |
| each end product regulates its own | branch of the pathway |
| feedback inhibition | also called end product inhibition |
| inhibition of one or more critical enzymes in a pathway regulates | entire pathway |
| pacemaker enzyme | catalyzes the slowest or rate-limiting reaction in the pathway |
Created by:
Whereis_raye