ch3 sh2 review 26

Are enzymes used up in chemical reactions?

• Yes, they can not be used again for another reaction

• No, they can be used again in another reaction

Enzymes are "Specific", which best describes this?

• function best under certain environmental conditions

• speeds up only one type of reaction.

• can catalyze the same reaction over and over again.

Enzymes are considered to be 

• Lipids
• Carbohydrate
• Proteins

• 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

Where do substrates bind on an enzyme?

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

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

• reusable
• catalyst
• specific
• fragile

What 3 letters do enzymes typically end in?

• -ose
• -ase
• -ese
• -tic

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 .
  

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.

What factors affect an enzyme's reaction rate?

• temperature 
• pH
• substrate concentration
• all of these