Enzymes and Chemical Reactions

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. 

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-PS1-5

Which concentration of catalase will produce the fastest reaction rate?

• 5%

• 10%

• 15%

• 20%

Tags

NGSS.HS-PS1-5

Some proteins catalyze biochemical reactions. If a genetic defect prevented a protein catalyst from being produced, which of the following do you predict would happen in the cell?

• The cell would find a different type of protein to catalyze the reaction.

• The reaction the protein catalyzes would proceed very slowly or not at all.

• The reaction the protein catalyzes would only occur in some places in the cell.

• The reverse reaction of the one the protein catalyzes would begin to proceed.

Tags

NGSS.HS-LS3-2

Which best explains why the rate of biochemical reaction decreases at high temperatures?

• The activation energy increases

• The shape of the enzyme changes

• The enzyme-substrate complex forms

• The bonds between substrates are broken

SC. 912.L.18.1 Some proteins catalyze biochemical reactions. If a genetic defect prevented a protein catalyst from being produced, which of the following do you predict would happen in the cell?

• The cell would find a different type of protein to catalyze the reaction.

• The reaction the protein catalyzes would proceed very slowly or not at all.

• The reaction the protein catalyzes would only occur in some places in the cell.

• The reverse reaction of the one the protein catalyzes would begin to proceed.

Tags

NGSS.HS-LS1-1

Which best explains why the rate of a biochemical reaction decreases at high temperatures?

• The activation energy increases.

• The shape of the enzyme changes.

• The enzyme-substrate complex forms.

• The bonds between substrates are broken.

Which of the factors does NOT affect enzymatic activity?

• Temperature

• pH

• Concentration

• Color

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

• 15^oC

• 40^oC

• 30^oC

• 35^oC