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Combined science (Edexcel Foundation)
Biological molecules and enzymes

Starter quiz

  • What type of molecule are enzymes?
    • proteins  ✓
    • lipids
    • carbohydrates
    • amino acids
  • True or false? Enzymes can affect the rate of a reaction.
    • True ✓
    • False
  • Enzymes <span class="blank">______</span> the amount of activation energy needed for a reaction to take place.
    Enzymes ______ the amount of activation energy needed for a reaction to take place.
    • 'lower' ✓
  • What region on an enzyme does the substrate bind to?
    What region on an enzyme does the substrate bind to?
    • substrate site
    • active site  ✓
    • complex site
    • enzyme substrate complex site
  • What can be said about the shape of the active site and the substrate shape?
    • they are the same
    • they are complementary  ✓
    • the substrate is like a lock and the enzyme is like a key
  • Put the steps in order to show how an enzyme works.
    • 1
      ⇔
      the substrate and enzyme collide
    • 2
      ⇔
      the substrate binds to the enzyme
    • 3
      ⇔
      an enzyme substrate complex forms
    • 4
      ⇔
      a chemical reaction takes place
    • 5
      ⇔
      the product(s) are released
    • 6
      ⇔
      the enzyme is free to catalyse another reaction
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