Enzymes

Most enzymes are classified as

• Carbohydrates

• Proteins

• Lipids

• Nucleic Acids

Enzymes work by

• Increasing activation energy

• Decreasing activation energy

• Keeping activation energy stable

• All of the above

The reactants that an enzyme works upon are called

• catalyst

• endothermic

• exothermic

• substrate

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.

Tags

NGSS.HS-PS1-4

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 .
  

Which phrase best describes the enzyme-substrate relationship?

• Each enzyme can act upon 100's of different substrates.

• Enzymes are substrate specific.

• Each enzyme can act upon any substrate.

• Enzymes slow down the reaction of the substrate.

What 3 letters do enzymes typically end in?

• -ose
• -ase
• -ese
• -tic

pH and temperature can ________ an enzyme.

• denature

• endothermic

• exothermic

• catalyze

What is the purpose  of an enzyme?

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

Tags

NGSS.MS-LS1-7

Where do substrates bind on an enzyme?

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