Enzymes and Their Functions Quiz

Which statement best describes the main function of enzymes in living organisms?

• They store genetic information

• They speed up chemical reactions

• They provide energy for cells

• They transport oxygen in the blood

Why are enzymes considered biological catalysts?

• They increase the temperature of reactions

• They are used up during reactions

• They speed up reactions without being changed

• They produce new enzymes during reactions

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What is activation energy?

• The energy released after a reaction

• The energy needed to start a chemical reaction

• The energy stored in food molecules

• The energy required to stop a reaction

How do enzymes affect activation energy?

• They increase the activation energy needed

• They eliminate activation energy completely

• They lower the activation energy required

• They store activation energy for later use

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The active site of an enzyme is best described as —

• the part that stores energy

• the location where the substrate binds

• the area that produces new enzymes

• the region that controls temperature

Which term describes the molecule an enzyme acts upon?

• Catalyst

• Product

• Substrate

• Inhibitor

An enzyme that breaks down starch would most likely NOT work on proteins because enzymes —

• only function at low temperatures

• are specific to certain substrates

• are destroyed after one reaction

• can only function in plants

What happens to an enzyme when it becomes denatured?

• It becomes more effective

• Its shape changes and it stops working

• It multiplies rapidly

• It gains energy from the reaction

Which condition would MOST likely cause an enzyme to denature in the human body?

• Normal body temperature

• Extremely high temperature

• Neutral pH conditions

• Low substrate concentration

Why does enzyme activity slow down at very low temperatures?

• Enzymes lose their shape permanently

• Molecules move more slowly reducing collisions

• The enzyme is used up quickly

• Substrates become more reactive