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IGCSE O Level Biology Competitive Exam MCQs – Practice Test 5 (Chapter 19)

What Are Enzymes Multiple Choice Questions and Answers PDF – Test 5

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What Are Enzymes MCQs with Answers PDF Download – Test 5

MCQ 21: Enzymes are largely composed of:

  1. fat
  2. carbohydrates
  3. proteins
  4. minerals

MCQ 22: When body produces enzymes?

  1. regularly
  2. only when they are needed
  3. on a cyclic routine
  4. commonly found in blood

MCQ 23: To expedite heating potassium chlorate (KClO3) to get oxygen (O2) and potassium chloride (KCl), the suitable catalyst maybe:

  1. silver
  2. chlorine
  3. manganese oxide
  4. citric acid

MCQ 24: When potassium chlorate (KClO3) is heated, the products include:

  1. potassium chloroform and water
  2. Potassium chloride and water
  3. potassium chloride and enzymes
  4. Potassium carbonate and oxygen

MCQ 25: Amylase works optimally at a pH of:

  1. 4
  2. 4.5
  3. 7
  4. 9

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