Biology - 2.4 - Chemical Reactions and Enzymes (2)

An enzyme speeds up a reaction by

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

Tags

NGSS.HS-PS1-4

In a chemical reaction, a reactant binds to an enzyme at a region known as the

• catalyst.
• product.
• substrate.
• active site. 

Chemical reactions may involve which of the following? (Choose all that apply)

• the breaking of bonds.

• the formation of new bonds.

• the rearrangement of bonds.

• enzymes. 

Chemical reactions that release energy often occur 

• spontaneously.
• nonspontaneously.
• rapidly.
• slowly. 

Tags

NGSS.HS-PS1-4

Chemical reactions that absorb energy often occur 

• spontaneously.
• nonspontaneously.
• rapidly.
• slowly. 

The enzyme catalase speeds up the chemical reaction that changes hydrogen peroxide into oxygen and water. The amount of oxygen given off is an indication of the rate of the reaction. Based on the graph, what can you conclude?

• Reaction rate decreases with increasing enzyme concentration.
• Reaction rate increases with decreasing enzyme concentration.
• Reaction rate increases with increasing enzyme concentration.
• The variables are indirectly proportional.

Tags

NGSS.HS-PS1-2

Which concentration of catalase will produce the fastest reaction rate?

• 5%
• 10%
• 15%
• 20%

Tags

NGSS.HS-PS1-5

Which of the factors does NOT affect enzymatic activity?

• Temperature
• pH
• Concentration
• Color

An enzyme is a catalyst.

• True
• False

What type of catalyst is an enzyme?

• Biological
• Mechanical
• Chemical
• Electrical