B2 - Enzymes

  • Catalysts
  • pH and temperature
  • Shapes
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What is the definition of a catalyst?
A catalyst is a substance which increases the spped of a reaction, without being changed or used up in the reaction.
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What are enzymes used for?
Enzymes are biological catalysts that speed up the useful chemical reactions in the body.
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What are enzymes made of?
Enzymes are proteins so are made of chains of amino acids. They also act as structural components of tissues, hormones and antibodies.
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Why don't enzymes change their shape?
Every enzyme has a uniqu shape that fits onto the substance involved in the reaction. They usually only catalyse one reaction. This is because for an enzyme to work, the substance has to fit a special shape.
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What conditions do enzymes work best at?
Enzymes work best at 37 degrees celcius and at pH 7. If this changes, the rate of reaction will change.
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Card 2

Front

What are enzymes used for?

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Enzymes are biological catalysts that speed up the useful chemical reactions in the body.

Card 3

Front

What are enzymes made of?

Back

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Card 4

Front

Why don't enzymes change their shape?

Back

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Card 5

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What conditions do enzymes work best at?

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