Catalysed Reactions

What will happen when enzyme is denatured?

• A proton is added or removed from the enzyme.

• It reaches its temperature at which it exhibits maximum activity.

• A substance binds to it which slows or stops its normal catalytic function.

• It changes shape and the active site no longer matches the shape of the substrate molecule.

TRUE OR FALSE. The enzyme activity gradually lowers as the temperature rises more than the optimal temperature.

• True

• False

TRUE OR FALSE. Competitive and noncompetitive enzyme inhibitor both slows or stops the normal catalytic function of an enzyme.

• True

• False

This graph shows the enzyme activity when substrate concentration is increased. What is the reason of this enzyme activity pattern?

• There is no available substrate.

• The active site changes its shape, thus, preventing the substrate from binding.

• High substrate concentration affects the temperature at which enzymes work best.

• Enzymes are all occupied, the incoming substrate molecules must wait for an active empty site.

TRUE OR FALSE. All enzymes have a certain pH range at which they work best.

• True

• False

Why an increased in temperature (up to the optimum temperature) increases the enzyme reaction?

• Because kinetic energy of molecules decreases.

• Because kinetic energy of molecules increases.

• Because denaturation of enzymes occurs.

• Because inhibitors are eliminated at this condition.

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 solid line on the graph represents the product formed over time for a reaction in a cell.

Which other line represents the effect of adding the enzyme for this reaction?

• A

• B

• C

• D

Tags

NGSS.HS-LS1-7

What is the factor limiting the rate in region X?

• substrate concentration

• enzyme concentration

• temperature

• number of active sites

What would limit the initial rate of reaction at point X?

• enzyme concentration

• pH

• substrate concentration

• temperature