Enzymes Quiz
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The conditions in which an enzyme is most active.
A. Optimum
B. Specific
C. Denatured
D. Highest
What are the products of the reaction catalysed by catalase?
A. Carbon dioxide and water
B. Oxygen and glucose
C. Oxygen and water
D. Hydrogen peroxide and water
What does the pH of a solution measure?
A. The temperature
B. The concentration of reactants
C. The acidity or alkalinity
D. The rate of the reaction
Each enzyme only has 1 substrate that will fit its active site. What is this called?
A. reusablility
B. denaturation
C. specificity
D. fragility
During a synthesis reaction smaller substrates are
A. broken down into larger products.
B. built up to form larger products.
C. broken down into smaller products.
D. built up into smaller products.
In the synthesis reaction example provided, what is the substrate?
A. Phosphorylase
B. Starch
C. Glucose
The energy needed to start a reaction is known as…
A. enzyme
B. activation energy
C. substrate
D. Denaturing
What reaction does Amylase catalyse?
A. It converts maltose into starch.
B. It breaks down starch into maltose.
C. It synthesises starch from maltose.
D. It acts as a substrate for producing maltose.
Which of the following best explains why enzymes are necessary for many cellular reactions?
A. Enzymes supply the oxygen necessary for the reactions
B. Enzymes change reactants from solid to liquids during the reactions.
C. The reactions take up too much space in the cell if the enzymes are missing.
D. The reactions are too slow to meet the needs of the cell if enzymes are missing.
What is a substrate?
A. A product formed at the end of a reaction.
B. A tool used by enzymes to increase reaction speed.
C. The chemical substance(s) on which an enzyme acts.
D. A type of enzyme that speeds up chemical reactions.
Why do extremes of pH cause a drop in enzyme activity?
A. They increase the activation energy
B. They decrease the concentration of substrates
C. They can denature the enzyme
D. They change the temperature
What is the key idea about the wide range of reactions catalyzed by enzymes?
A. Enzymes only catalyze breakdown reactions
B. Enzymes catalyze a variety of reactions in metabolism
C. Enzymes only catalyze synthesis reactions
D. Enzymes only catalyze reactions with specific substrates
What is the definition of the term ‘optimum’?
A. The conditions at which the enzyme is most active.
B. The range of pH and temperature an enzyme works over.
C. The conditions at which the substrate is most active
What happens to the enzymes during a chemical reaction they catalyze?
A. They are used up
B. They are not used up
C. They are converted to a different enzyme
D. They increase in concentration
Which of the following enzymes is used for making lactose-free products?
A. Amylase
B. Lactase
C. Protease
D. Catalase
How do enzyme and substrate molecules interact?
A. They repel each other due to opposite charges.
B. They dissolve into each other to speed up reactions.
C. They fit together due to their complementary shapes
D. They bind randomly without any specific alignment.
What would likely occur without enzymes in biological systems?
A. Reactions would occur at a normal rate.
B. Reactions would happen too slowly to support life.
C. Reactions would speed up uncontrollably.
D. Reactions would not be affected.
What is the reason for the drop in enzyme activity at temperatures above the optimum?
A. The activation energy increases
B. The substrate concentration decreases
C. The enzymes denature
D. The pH changes
In the diagram, what is letter A?
A. product
B. substrate
C. enzyme-substrate complex
D. active site
The diagram shows what type of enzyme reaction
A. Synthesis
B. Degredation
Which of the following is true about enzymes?
A. Enzymes are proteins that can undergo denaturation
B. Enzymes are inorganic catalysts
C. Enzymes are carbohydrates that provide energy
D. Enzymes are lipids that store genetic information
What theory explains the specificity of enzymes?
A. Open door theory
B. Lock and Key theory
C. Proximity theory
D. Transition State theory
What is an enzyme?
A. A type of protein that increases the rate of a chemical reaction
B. A type of inorganic catalyst
C. A type of carbohydrate that provides energy
D. A type of lipid that stores genetic information
How does an enzyme function as a catalyst?
A. By increasing the temperature of the reaction
B. By changing the pH of the reaction
C. By providing energy for the reaction
D. By lowering the activation energy of the reaction
What factors can affect the activity of an enzyme?
A. Temperature and pH
B. Concentration of the enzyme
C. Concentration of the substrate
D. All of the above
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