AP Bio enzyme activity graphs and temperature key terms
Study enzyme activity graphs, temperature effects, and key terms relevant to AP Biology cell biology concepts.
Quiz(36 questions)
1. What is the effect of a temperature increase on the rate of enzyme-catalyzed reactions until the optimal temperature is reached?
Terms in this Study Set(36)
Enzyme Activity Basics(16)
What is an enzyme?
A biological catalyst that speeds up biochemical reactions by lowering the activation energy.
Define activation energy.
The minimum energy required for a chemical reaction to occur.
True or False: Enzymes are consumed in reactions.
False - Enzymes are not consumed and can be reused multiple times.
What does a typical enzyme activity graph display?
Enzyme activity (reaction rate) vs. substrate concentration, temperature, or pH.
Fill in the blank: The region where substrate binds to an enzyme is called the _____.
active site.
How does substrate concentration affect enzyme activity?
As substrate concentration increases, reaction rate increases until a saturation point is reached.
Compare competitive and non-competitive inhibition.
Competitive inhibition: substrate and inhibitor compete for the active site. Non-competitive: inhibitor binds elsewhere, altering enzyme function.
What is Vmax?
The maximum rate of reaction when the enzyme is saturated with substrate.
What does the term 'turnover number' refer to?
The number of substrate molecules converted to product by an enzyme per unit time.
What happens to enzyme activity at low temperatures?
Enzyme activity decreases due to lower kinetic energy and fewer successful collisions.
What is Km (Michaelis constant)?
The substrate concentration at which the reaction rate is half of Vmax; indicates enzyme affinity.
True or False: Enzymes can work at any pH level.
False - Enzymes have optimal pH levels and can denature outside those ranges.
How does enzyme concentration affect reaction rate?
Increasing enzyme concentration generally increases reaction rate, assuming substrate is not limiting.
What is denaturation?
The process where an enzyme loses its three-dimensional structure, resulting in loss of function.
What role do cofactors play in enzyme activity?
Cofactors are non-protein molecules that assist enzymes in catalyzing reactions.
What does a sigmoidal curve indicate in enzyme kinetics?
It indicates cooperative binding, often seen in allosteric enzymes.
Temperature Effects on Enzymes(20)
What happens to enzyme activity at high temperatures?
Enzyme activity typically increases with temperature until it reaches an optimal point, then it declines due to denaturation.
Define optimal temperature.
The optimal temperature is the temperature at which an enzyme's activity is maximized.
True or false: All enzymes have the same optimal temperature.
False - Different enzymes have different optimal temperatures based on their environment.
Fill in the blank: Enzymes typically denature at temperatures above _____ °F.
113 °F.
Cause → Effect: Increase in temperature.
Increased kinetic energy leads to more substrate-enzyme collisions, enhancing reaction rates until denaturation occurs.
How does cold temperature affect enzyme activity?
Cold temperatures decrease enzyme activity due to reduced kinetic energy, leading to fewer effective collisions.
What is denaturation?
Denaturation is the process where an enzyme's structure is altered, impairing its function, often due to extreme temperatures.
Compare low temperature and high temperature effects on enzymes.
- Low: slows down reactions. - High: may denature enzymes.
What is the expected effect of a temperature increase of 10°C?
Generally, enzyme activity doubles for every 10°C increase until the optimal temperature is reached.
Which enzyme is found in human stomachs?
Pepsin, which functions optimally at a low pH and around 98.6 °F.
True or false: Enzymes work faster at lower temperatures.
False - Enzymes work faster at higher temperatures, up to their optimal point.
Fill in the blank: Enzyme activity drops sharply after _____ °F.
113 °F.
What happens when a cold enzyme is warmed gradually?
It may regain activity as it approaches its optimal temperature.
What is the effect of temperature on enzyme-substrate complexes?
Higher temperatures increase formation and breakdown of these complexes, enhancing reaction rates until denaturation.
Why do enzymes in thermophiles have high optimal temperatures?
They are adapted to thrive at high temperatures, maintaining structure and function.
What is the primary reason enzymes denature at high temperatures?
The heat disrupts hydrogen and ionic bonds that maintain enzyme structure.
What term describes enzymes that function best at low temperatures?
Psychrophilic enzymes.
How do competitive inhibitors affect enzyme activity in temperature changes?
They can reduce the rate of reaction, especially at higher temperatures where kinetic energy is increased.
What is enzyme specificity?
The ability of an enzyme to selectively catalyze a specific reaction; can be affected by temperature.
Compare enzyme activity at 25 °F and 75 °F.
- 25 °F: Low activity. - 75 °F: Optimal activity for most human enzymes.
Questions in this Study Set(36)
1. What is the effect of a temperature increase on the rate of enzyme-catalyzed reactions until the optimal temperature is reached?
2. What is the primary function of an enzyme?
3. What is the optimal temperature for most human enzymes?
4. How does increasing temperature generally affect enzyme activity?
5. Which of the following statements is true regarding enzyme denaturation?
6. What does 'Vmax' represent in enzyme kinetics?
7. Fill in the blank: Enzymes typically become denatured at temperatures above _____ °F.
8. Which of the following statements about competitive inhibition is false?
9. How does a decrease in temperature generally affect enzyme activity?
10. What is the role of an enzyme's active site?
11. Which of the following enzymes is adapted to function at high temperatures?
12. What happens to enzyme activity at very high temperatures?
13. What happens to enzyme activity above the optimal temperature?
14. What does the Michaelis constant (Km) indicate?
15. True or false: All enzymes have the same optimal temperature.
16. How does enzyme concentration affect the reaction rate?
17. What is the primary effect of a 10 °C increase in temperature on enzyme activity?
18. Which of the following is an example of non-competitive inhibition?
19. Which term describes enzymes that function best at low temperatures?
20. What is denaturation in the context of enzymes?
21. What effect does cold temperature have on enzyme-substrate complex formation?
22. Which factor does NOT affect enzyme activity?
23. Which of the following is NOT a consequence of enzyme denaturation?
24. What does a sigmoidal curve in enzyme kinetics typically indicate?
25. How do competitive inhibitors interact with enzymes at higher temperatures?
26. What is the effect of pH on enzyme activity?
27. When an enzyme is gradually warmed from a cold temperature, what can happen?
28. What does 'turnover number' refer to?
29. What is the primary reason enzymes denature at high temperatures?
30. Which of the following is true about cofactors?
31. What is the expected enzyme activity at 25 °F compared to 75 °F?
32. What does an increase in substrate concentration typically lead to in enzyme-catalyzed reactions, assuming there is enough enzyme present?
33. How does increased kinetic energy at higher temperatures affect enzyme reactions?
34. What occurs to an enzyme's structure when it is exposed to temperatures above its optimal range?
35. Which of the following scenarios describes the effect of a cold environment on enzyme activity?
36. Which of the following is NOT true about enzyme activity in relation to temperature?
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