Enzymes MCQs with answers Page - 1

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Q. Which statement best describes the function of enzymes?

  • (A) They slow down chemical reactions
  • (B) They increase the activation energy of reactions
  • (C) They speed up chemical reactions without being used up
  • (D) They are used up during reactions

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Q. What is the region on an enzyme where the substrate binds called?

  • (A) Active site
  • (B) Binding site
  • (C) Catalytic pocket
  • (D) Reaction zone

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Q. Enzyme activity is affected by:

  • (A) Temperature
  • (B) pH
  • (C) Substrate concentration
  • (D) All of the above

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Q. Which enzyme breaks down starch into sugar?

  • (A) Pepsin
  • (B) Lipase
  • (C) Amylase
  • (D) Trypsin

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Q. Which of the following is a digestive enzyme?

  • (A) Hemoglobin
  • (B) Keratin
  • (C) Pepsin
  • (D) Collagen

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Q. What happens to enzymes at very high temperatures?

  • (A) They become more active
  • (B) They denature and lose function
  • (C) They change substrate type
  • (D) They multiply

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Q. Which of the following best defines a catalyst?

  • (A) A substance that slows down reactions
  • (B) A substance that speeds up reactions without being consumed
  • (C) A substance that changes the products
  • (D) A substance that increases activation energy

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Q. Which of the following enzymes helps in fat digestion?

  • (A) Amylase
  • (B) Lipase
  • (C) Pepsin
  • (D) Trypsin

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Q. The enzyme that helps in DNA replication is:

  • (A) Amylase
  • (B) Pepsin
  • (C) DNA polymerase
  • (D) Lipase

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Q. Which of the following statements about enzymes is TRUE?

  • (A) They can be used up in reactions
  • (B) They lower the activation energy of reactions
  • (C) They increase the activation energy of reactions
  • (D) They change the equilibrium of a reaction
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