Enzymes

What is the substance called that speeds up a chemical reaction?

• Reusable

• Catalyst

• Specific

• Fragile

With what 3 letters do enzymes typically end?

• -ose
• -ase
• -ese
• -tic

Enzymes are an example of __________?

• Lipids

• Carbohydrate

• Protein

• Nucleic Acid

An enzyme speeds up a reaction by______?

• Lowering the activation energy.

• Raising the activation energy.

• Releasing energy.

• Absorbing energy.

What happens when enzymes are heated to a high temperature?

• The enzymes die.

• The shape of the enzyme are changed and it denatures.

• The enzymes' amino acid sequence changes.

• The enzymes remain the same.

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

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 .
  

An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 

• True

• False

What is the function of an enzyme?

• Enzymes break themselves into small pieces.

• Enzymes slow down chemical reactions.

• Enzymes speed up chemical reactions.

• Enzymes combine products to form reactants.

Which of these is most likely an enzyme?  

• Sucrose
• Galactose
• Fructose
• Amylase