Enzymes Day 2

Where do substrates bind on an enzyme?

• voltage-gated channels

• surface receptor

• calcium channels

• active site

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 .
  

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

• reusable

• catalyst

• specific

• fragile

Any substance that is acted upon by an enzyme is called a(n)?

• Coenzyme

• Substrate

• Vitamin

• Polypeptide

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.

• Enzymes decrease the activation energy of the reaction.

• Enzymes reverse the direction of the reaction.

When an enzyme denatures it means it can______________.

• function properly

• no longer function

• be okay

• need oxygen

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

• 15^oC

• 40^oC

• 30^oC

• 35^oC

What does inhibit mean?

• To change the shape of an enzyme

• To slow or stop an enzyme from binding correctly with its substrate

• To create new products

• To destroy the substrate

An enzyme speeds up a reaction by

• lowering the activation energy.

• raising the activation energy.

• releasing energy.

• absorbing energy.

An enzyme could denature due to extreme temperatures or pH. Denature means ______________

• to unfold or change shape

• to make bigger

• to increase the function

• to speed up