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 (B)</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 (D)</p> Signup and view all the answers

Which factor does not affect enzyme activity?

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

Under what conditions does denaturation of enzymes occur?

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

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

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

Which disease is NOT associated with markers involving enzymes?

<p>Diabetes (D)</p> Signup and view all the answers

What is the main function of enzymes in living organisms?

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

Flashcards

What is the primary function of enzymes?

Enzymes are biological catalysts that speed up chemical reactions in living organisms.

What causes enzyme denaturation?

Enzymes can lose their shape and function when exposed to extreme heat or pH changes.

What makes enzymes soluble?

Enzymes are soluble in water, salt, glycerol, and alcohol due to their polar nature.

What factors affect enzyme activity?

Enzyme activity is influenced by temperature, pH, enzyme concentration, and substrate concentration.

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How do enzymes benefit the human body?

Enzymes play a vital role in various bodily processes, aiding in respiration, digestion, and organ function.

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Which factor DOESN'T affect enzyme activity?

Enzyme concentration doesn't directly affect enzyme activity. It only affects the rate at which the reaction occurs.

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What are the conditions for enzyme denaturation?

High heat is the primary cause of enzyme denaturation, leading to loss of function.

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What property allows enzymes to remain unchanged?

The colloidal nature of enzymes allows them to remain unchanged after the reaction, enabling them to catalyze multiple reactions.

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Which disease isn't linked to enzyme markers?

Enzymes are widely involved in various diseases, but diabetes is not primarily associated with enzyme markers.

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What is the main function of enzymes in living organisms?

Enzymes are biological catalysts that speed up chemical reactions in living organisms.

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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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