Grade 11 Biology Enzymes Quiz
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Questions and Answers

What is the main function of enzymes in living organisms?

  • To increase activation energy
  • To decrease the rate of chemical reactions
  • To remain unchanged after the reaction
  • To act as biological catalysts and accelerate chemical reactions (correct)
  • Under what conditions does denaturation of enzymes occur?

  • High heat and pH changes (correct)
  • Low heat and high pH
  • Low heat and neutral pH
  • High heat and low salt concentrations
  • What property of enzymes allows them to dissolve in water, salt, glycerol, and alcohol?

  • Molecular weight
  • Colloidal nature
  • Solubility (correct)
  • Precipitation
  • What factors does enzyme activity depend on?

    <p>Temperature, pH, enzyme concentration, and substrate concentration</p> Signup and view all the answers

    How do enzymes aid the human body?

    <p>By speeding up chemical reactions and aiding in respiration, digestion, liver, muscle, and nerve function</p> Signup and view all the answers

    Which factor does not affect enzyme activity?

    <p>Enzyme concentration</p> Signup and view all the answers

    Under what conditions does denaturation of enzymes occur?

    <p>High heat</p> Signup and view all the answers

    Which property of enzymes allows them to remain unchanged after the reaction?

    <p>Colloidal nature</p> Signup and view all the answers

    Which disease is NOT associated with markers involving enzymes?

    <p>Diabetes</p> Signup and view all the answers

    What is the main function of enzymes in living organisms?

    <p>Speeding up chemical reactions</p> Signup and view all the answers

    Study Notes

    Enzyme Functions and Properties

    • The main function of enzymes in living organisms is to catalyze metabolic reactions, increasing reaction rates and efficiency.

    Enzyme Denaturation

    • Denaturation of enzymes occurs under conditions such as high temperatures, extreme pH, and exposure to organic solvents or heavy metals, causing the loss of their native structure and function.

    Enzyme Solubility

    • The property of enzymes that allows them to dissolve in water, salt, glycerol, and alcohol is their amphipathic nature, having both hydrophilic and hydrophobic regions.

    Factors Affecting Enzyme Activity

    • Enzyme activity depends on factors such as temperature, pH, substrate concentration, and the presence of inhibitors or activators.

    Enzymes in the Human Body

    • Enzymes aid the human body by facilitating various physiological processes, including digestion, energy production, and detoxification.

    Factors Not Affecting Enzyme Activity

    • The factor that does not affect enzyme activity is light.

    Enzyme Reactivation

    • Enzymes remain unchanged after a reaction due to their property of catalysis, allowing them to react multiple times without being consumed.
    • The disease NOT associated with markers involving enzymes is hypertension.

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    Description

    Test your knowledge of enzymes in this Grade 11 biology quiz. Explore the role of enzymes as biological catalysts and their involvement in cell metabolism. Learn about the physical properties and functions of enzymes.

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