Factors Affecting Enzyme Action (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
When investigating temperature effects on enzymes, which variables must be kept constant?
When investigating temperature effects on enzymes, which variables must be kept constant?
pH, enzyme concentration, substrate concentration
How is the relationship between an enzyme and its substrate best described?
How is the relationship between an enzyme and its substrate best described?
Complementary
Why does increasing temperature initially increase enzyme reaction rate?
Why does increasing temperature initially increase enzyme reaction rate?
Raises kinetic energy, more collisions
At what temperature does denaturation typically occur for most enzymes?
At what temperature does denaturation typically occur for most enzymes?
Approximately 60°C
What happens to enzyme activity at the optimum temperature?
What happens to enzyme activity at the optimum temperature?
Reaction rate is at its maximum
How do pH changes affect enzyme active sites?
How do pH changes affect enzyme active sites?
Alter charges on amino acid residues
What effect do small pH shifts typically have on enzymes in living organisms?
What effect do small pH shifts typically have on enzymes in living organisms?
Reduce activity temporarily
What happens when enzyme concentration increases while substrate is in excess?
What happens when enzyme concentration increases while substrate is in excess?
Reaction rate increases proportionally
What happens when enzyme concentration increases but substrate is the limiting factor?
What happens when enzyme concentration increases but substrate is the limiting factor?
No effect on reaction rate
What is in relation to substrate concentration?
What is in relation to substrate concentration?
Maximum rate when all sites saturated