Enzymes are considered to be 
  • 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 are the enzymes called when they are at low temperature? 
  • denatured
  • Killed
  • inactive
  • normal
What are the enzymes called when they are at high temperature or extreme pH?
  • denatured
  • Killed
  • inactive
  • normal
What happens to an enzyme when it is denatured?
  • Activation energy is lowered.
  • It becomes stronger.
  • It loses its shape.
  • Activation energy is raised.
Which factors can change the shape of an enzyme and thus denatures a enzyme?
  • Excessive heat and changes in pH
  • Nothing can
  • Exposure to light and sound
  • Exposure to bacteria and Amoebas
Every enzyme has a optimal temperature and pH. True or False?
  • True 
  • False
Based on the graph, what temperature does this enzyme work best? 
sc-5 sb-2-Enzymeimg_no 560.jpg
  • 15 C
  • 40 C
  • 30 C
  • 47 C
Which of the following conclusions can be drawn from this graph?
sc-5 sb-2-Enzymeimg_no 561.jpg
  • 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 .
Cells can only work if their enzymes are functioning. What can you infer from the graph?
sc-5 sb-2-Enzymeimg_no 562.jpg
  • Cells function best at low pH values
  • Cells function fine at all pH values
  • Cells function best at high pH values
  • Cells do not function well if the pH is too high or too low
What is the optimal pH of enzyme A?
sc-5 sb-2-Enzymeimg_no 563.jpg
  • 8
  • 2
  • 5.7-10
  • 10
What is the optimal pH of enzyme B?
sc-5 sb-2-Enzymeimg_no 564.jpg
  • 8
  • 2
  • 5.7-10
  • 10
The graph shows the relative rates of action of four enzymes, A, B, C, and D. Which enzyme shows the greatest change in its rate of action with the least change in pH?
sc-5 sb-2-Enzymeimg_no 565.jpg
  • enzyme A 
  • enzyme B 
  • enzyme C
  • enzyme D
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
  • reusable
  • catalyst
  • specific
  • fragile
Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate.  What is this called?
  • reusable
  • catalyst
  • specific
  • fragile
Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?
  • reducing the number of products   
  • reducing the activation energy
  • increasing the temperature of the cell
  • increasing the concentration of reactants 
What is structure E, F, G?
sc-7 sb-3-Enzymeimg_no 236.jpg
  • Substrate
  • Active site
  • Enzyme
  • Products
What is structure C?
sc-7 sb-3-Enzymeimg_no 237.jpg
  • Substrate
  • Active site
  • Enzyme
  • Products
What is structure A?
sc-7 sb-3-Enzymeimg_no 238.jpg
  • Substrate
  • Active site
  • Enzyme
  • Products
The graph shows the relative rates of action of four enzymes, A, B, C, and D. Which enzyme shows the greatest change in its rate of action with the least change in pH?
sc-7 sb-3-Enzymeimg_no 239.jpg
  • enzyme A
  • enzyme B
  • enzyme C
  • enzyme D
Which of the following conclusions can be drawn from this graph?
sc-7 sb-3-Enzymeimg_no 240.jpg
  • 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 .
Based on the graph, what temperature does this enzyme work best?
sc-7 sb-3-Enzymeimg_no 241.jpg
  • 15 C
  • 40 C
  • 30 C
  • 47 C
Which of the following enzymes catalyze the reaction below? Sucrose + water ➡ Fructose + glucose
  • Amylase
  • Pepsin
  • Cellulase
  • Sucrase
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