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17 Cards in this Set
- Front
- Back
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An enzyme is a ___________ catalyst that accelerate reactions by reducing the __________. It only changes the ______________ but does not change the _____________.
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Protein
Activation Energy Rate Equilibrium point |
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The overall change in free energy (delta G) with the influence of enzymes is ____________
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0; Stays the same.
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The molecule upon which an enzyme acts is called the:
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Substrate
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The bondage of enzyme and substrate is called the _______ complex
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Enzyme-substrate
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Enzyme specificity on the active site of the enzyme is based on two models called...
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The induced fit model
Lock and Key Model |
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Lock and Key model
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Enzyme has exactly complementary active site to substrate
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Induced Fit Model
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Active site on enzyme has flexibility to substrate
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To be catalytically active, enzymes must use non-protein molecules called:
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Cofactors
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An enzyme devoid of necessary cofactor is called
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apoenzyme
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An enzyme contain its cofactor is called
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haloenzyme
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Cofactors are bound by: (2)
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Weak non-covalent
Strong Covalent bonds |
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What is a tightly bound cofactor to enzyme called?
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Prosthetic Group
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Small organic cofactors are called:
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Coenzymes
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The two regulators of enzymatic activity is .....
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allosteric effects and inhibitory interactions
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Allosteric regulation
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The use of a regulatory site to either create a conformational change in enzyme to stimulate activity (activator) or seal active site (inhibitor)
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The three types of enzyme inhibition and def.
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Feedback: The use of end product to inhibit process of earlier events
Competitive: The binding of inhibitor to active site Non Competitive: Strong covalent bonds that can be allosteric or not. May never be displaced thus it is irreversible. |
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Inactive form of an enzyme.
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zymogen (enzymes ending in -ogen)
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