Podcast
Questions and Answers
What is the primary role of enzymes in biological reactions?
What is the primary role of enzymes in biological reactions?
How does the induced fit model differ from the lock-and-key model?
How does the induced fit model differ from the lock-and-key model?
What happens to enzymes at temperatures above their optimum level?
What happens to enzymes at temperatures above their optimum level?
What effect does pH have on enzyme activity?
What effect does pH have on enzyme activity?
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Which statement best describes how temperature affects enzyme-substrate complexes?
Which statement best describes how temperature affects enzyme-substrate complexes?
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What happens when an enzyme denatures?
What happens when an enzyme denatures?
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Which factor is NOT mentioned as affecting enzyme activity?
Which factor is NOT mentioned as affecting enzyme activity?
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Why are the effects of low temperatures on enzymes typically reversible?
Why are the effects of low temperatures on enzymes typically reversible?
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What is the primary effect of increasing substrate concentration in the presence of a competitive inhibitor?
What is the primary effect of increasing substrate concentration in the presence of a competitive inhibitor?
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How do non-competitive inhibitors affect the active site of an enzyme?
How do non-competitive inhibitors affect the active site of an enzyme?
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Which description accurately reflects the behavior of a non-competitive inhibitor?
Which description accurately reflects the behavior of a non-competitive inhibitor?
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What happens to the reaction rate in the presence of a non-competitive inhibitor when substrate concentration is increased?
What happens to the reaction rate in the presence of a non-competitive inhibitor when substrate concentration is increased?
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In what way does increasing enzyme concentration influence the formation of enzyme-substrate complexes?
In what way does increasing enzyme concentration influence the formation of enzyme-substrate complexes?
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Study Notes
Enzyme Function
- Enzymes are proteins with specific tertiary structures
- Active site complements a specific substrate
- Biological catalysts lowering activation energy
- Intracellular or extracellular
- Determine cellular and organism structure and function
Induced Fit Model
- Replaced the lock-and-key model
- Lock-and-key: substrates and enzymes have exact complementary shapes; active sites don't change shape
- Induced fit: active site not fully complementary; slightly changes shape when substrate binds, forming enzyme-substrate complex; stresses/forms bonds in substrate, lowering activation energy
Temperature Effects
- Increased temperature: more kinetic energy, more successful collisions, more enzyme-substrate complexes form
- High temperature: enzyme denatures; breaks hydrogen/ionic bonds between amino acid R groups; active site shape changes preventing enzyme-substrate complex formation
- Low temperature: reversible; high temperature effects are not reversible
pH Effects
- Enzymes denature above/below optimum pH
- H+ (acidic) or OH- (alkali) ions interfere with hydrogen/ionic bonds in amino acid R groups; active site shape changes
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Description
This quiz covers the essential concepts of enzyme function, focusing on their specific structures and catalytic abilities. Additionally, it explores the Induced Fit Model and temperature effects on enzyme activity. Test your understanding of these vital biological processes.
