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Questions and Answers
What is the primary role of enzymes in metabolic reactions?
What is the primary role of enzymes in metabolic reactions?
- To permanently change the products
- To be consumed in the reactions
- To slow down the reactions
- To act as biological catalysts (correct)
What is the optimum temperature for enzymes in the human body?
What is the optimum temperature for enzymes in the human body?
- 100°C
- 50°C
- 37°C (correct)
- 25°C
Which factor primarily influences the frequency of collisions between enzyme and substrate molecules?
Which factor primarily influences the frequency of collisions between enzyme and substrate molecules?
- The shape of the enzyme
- The kinetic energy of the molecules (correct)
- The concentration of products
- The presence of inhibitors
What does raising the concentration of a substrate typically do in enzyme-catalyzed reactions?
What does raising the concentration of a substrate typically do in enzyme-catalyzed reactions?
Extracellular enzymes primarily function in which part of the body?
Extracellular enzymes primarily function in which part of the body?
Flashcards
What are enzymes?
What are enzymes?
Enzymes are proteins that act as biological catalysts. They speed up chemical reactions in cells without being consumed or changed.
What is metabolism?
What is metabolism?
Metabolism refers to all the chemical reactions happening within a cell.
What's the role of enzymes in metabolism?
What's the role of enzymes in metabolism?
Enzymes catalyze, or speed up, metabolic reactions, making them happen faster.
What is the optimum temperature for enzymes?
What is the optimum temperature for enzymes?
The optimum temperature is the temperature at which an enzyme works best, leading to the fastest reaction rate.
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How does temperature affect enzyme activity?
How does temperature affect enzyme activity?
Higher temperatures increase the kinetic energy of enzymes and substrates, leading to more collisions and quicker reactions. However, very high temperatures can denature enzymes, meaning they lose their shape and stop working.
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Enzymes: Controlling Reactions in Cells
- Enzymes are proteins that catalyze reactions in cells
- Enzymes are biological catalysts, speeding up reactions without being consumed
- Cells contain many different enzymes, each catalyzing a specific reaction
- Enzymes' function is controlled by genes in the nucleus
- Reactions occur quickly enough in organisms at low temperatures only due to enzymes
- Thousands of different enzymes exist due to various protein structures
Factors Affecting Enzymes
- Temperature: Enzymes function optimally at a specific temperature, often close to body temperature
- Higher temps increase kinetic energy and collisions between substrate and enzyme, thus increasing reactions
- Temperatures beyond optimal greatly reduce reaction rates
- pH: pH levels influence reaction rates, optimums also exist for enzymes
- Enzyme activity is affected by substrate and enzyme concentrations
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