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Enzymes are an example of

• Lipids

• Carbohydrate

• Protein

• Nucleic Acid

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

What 3 letters do enzymes typically end in?

• -ose
• -ase
• -ese
• -tic

In a chemical reaction, ________ are what you have at the end

• Products

• Molecules

• Reactants

• Substances

An enzyme speeds up a reaction by

• lowering the activation energy.
• raising the activation energy.
• releasing energy.
• absorbing energy.

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered denature
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

What is a substance called if it speeds up a chemical reaction?

• reusable
• catalyst
• specific
• fragile

Every enzyme has a optimal temperature and pH. True or False?

• True 
• False

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .