Enzyme Quick Check

High temperatures can cause bonds between amino acids to change permanently. Which BEST describes why adding heat can cause reactions involving biological catalysts to slow down?

• 
  Adding heat to a reaction increases the amount of energy available for the enzyme.

• The shape of a biological catalyst can change due to the presence of heat, which will affect its ability to help connect the original molecules.

• The shape of the original molecules will stay the same in the presence of heat, which will increase its ability to connect to the biological catalyst. 

An enzyme speeds up a reaction by

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

Tags

NGSS.HS-PS1-4

Which statement is supported by the data in the graphs?

• The enzyme is very active at approximately 42°C and within a pH range of 2 to 6. 

• 
  The enzyme functions well at a temperature of 35°C and would be active at any pH value.

• The enzyme works best in a pH range of 6 to 8 and at a temperature of approximately 37° C.

• The enzyme's activity is greatest at pH 7 and would not be affected by a change in temperature.

Tags

NGSS.HS-PS1-5

Which statement is valid (true) based on the graph?

• The optimum (best) temperature of the enzyme is 30 degrees

• The optimum (best) temperature of the enzyme is 58 degrees

• The enzyme is denatured (destroyed) at 45 degrees

• The enzyme is denatured (destroyed) at 60 degrees

Tags

NGSS.HS-PS1-5

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 .
  

Label the parts of the enzyme model

a

b

c

d

Enzyme

Active site

Products

Substrate