Enzymes and Their Functions Practice Quiz

An enzyme speeds up a reaction by

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

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

• true
• false

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

• 15^oC
• 40^oC
• 30^oC
• 35^oC

What is the purpose of an enzyme?

• give permission for the biochemical reaction

• raise activation energy

• speed up biochemical reactions

• control how many reactions occur

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

What is the name for the mechanism of normal enzyme activity?

• lock and key

• jigsaw puzzle

• hammer and nail

• competitive inhibition

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 .
  

Normal body temperature is 37 degrees Celsius. At 40 degrees Celsius, your biological enzymes will...

• Function optimally

• Denature (change shape and break down)

• Wait until the temp. increases

• Wait until the temp. decreases

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

• reusable
• catalyst
• specific
• fragile

With what 3 letters do enzymes typically end?

• -ose
• -ase
• -ese
• -tic