Enzyme

Enzyme

Multiple Choice

Enzymes will make a reaction go _______ and use ______ energy.

• faster, less
• faster, more
• slower, less
• slower, more

Multiple Choice

What is the purpose  of an enzyme?

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

Multiple Choice

Which substrate would this enzyme catalyze?

Multiple Choice

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusable
• catalyst
• specific
• fragile

Multiple Choice

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

Multiple Choice

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 

Multiple Choice

What is structure E, F, G?

• Substrate

• Active site

• Enzyme

• Products

Multiple Choice

What is structure C?

• Substrate

• Active site

• Enzyme

• Products

Multiple Choice

What is structure A?

• Substrate

• Active site

• Enzyme

• Products

Multiple Choice

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?

• enzyme A

• enzyme B

• enzyme C

• enzyme D

Multiple Choice

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 .

Multiple Choice

Based on the graph, what temperature does this enzyme work best?

• 15 C

• 40 C

• 30 C

• 47 C

Multiple Choice

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

Multiple Choice

What happens to an enzyme when it is denatured?

• Activation energy is lowered.
• It becomes stronger.
• It loses its shape.
• Activation energy is raised.

Multiple Choice

What are the enzymes called when they are at high temperature or extreme pH?

• denatured

• Killed

• inactive

• normal

Multiple Choice

What are the enzymes called when they are at low temperature? 

• denatured
• Killed
• inactive
• normal

Multiple Choice

What happens when enzymes are heated to a high temperature?

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

Multiple Choice

Which of the following enzymes catalyze the reaction below?

Sucrose + water ➡ Fructose + glucose

• Amylase

• Pepsin

• Cellulase

• Sucrase