Test On Enzymes! Knowledge Trivia Quiz
Would you like to take this test on enzymes? This quiz will provide you with knowledge of enzymes. As it relates to this quiz, you need to understand what term is utilized to describe the energy necessary to get started, what accelerates a chemical reaction, how enzymes affect the reactions in living cells, and hydrogen ion concentration. This quiz will teach you more about enzymes. You will do a fantastic job on this quiz.
- 1.
What is the term used to describe the energy needed to get a reaction started?
- A.
Adhesion energy
- B.
Activation energy
- C.
Cohesion energy
- D.
Chemical energy
Correct Answer
B. Activation energyExplanation
Activation energy is the term used to describe the energy required to initiate a chemical reaction. It represents the energy barrier that must be overcome for reactant molecules to transform into products. This energy is needed to break the existing bonds in the reactant molecules and start the formation of new bonds in the product molecules. Activation energy determines the rate at which a reaction occurs and is influenced by factors such as temperature, concentration, and catalysts.Rate this question:
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- 2.
Which of the following statements about enzymes is NOT true? a. Enzymes work best at a specified pH. b. All enzymes have the same shape as their substrates. c. Enzymes are proteins. d. The shape of an enzyme allows it to do its job.
- A.
Enzymes work best at a specified pH
- B.
All enzymes have the same shaps as their substrates
- C.
Enzymes are proteins
- D.
The shape of an enzyme allows it to do its job
Correct Answer
B. All enzymes have the same shaps as their substratesExplanation
The statement "All enzymes have the same shape as their substrates" is not true. Enzymes have a specific three-dimensional shape, known as their tertiary structure, which allows them to bind to their substrates and catalyze chemical reactions. The shape of the enzyme's active site is complementary to the shape of its substrate, allowing for a specific and precise interaction. However, the shape of the enzyme itself is not the same as its substrate.Rate this question:
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- 3.
Which of the following statements is true about catalysts? a. Catalysts slow down the rate of chemical reactions. b. All catalysts are enzymes. c. Catalysts are used up during a chemical reaction. d. Catalysts lower the activation energy of a chemical reaction.
- A.
Catalysts slow down the rate of chemical reactions
- B.
All catalysts are enzymes
- C.
Catalysts are used up during a chemical reaction
- D.
Catalysts lower the activation energy of a chemical reaction
Correct Answer
D. Catalysts lower the activation energy of a chemical reactionExplanation
Catalysts are substances that increase the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. They do not slow down the rate of chemical reactions. Not all catalysts are enzymes, as enzymes are a specific type of catalyst found in living organisms. Catalysts are not used up during a chemical reaction, as they are not consumed in the reaction and can be reused. Therefore, the correct statement is that catalysts lower the activation energy of a chemical reaction.Rate this question:
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- 4.
A substance that accelerates the rate of a chemical reaction is called a(an)
- A.
Catalyst
- B.
Lipid
- C.
Molecule
- D.
Protein
Correct Answer
A. CatalystExplanation
A substance that accelerates the rate of a chemical reaction is called a catalyst. A catalyst works by providing an alternative reaction pathway with a lower activation energy, allowing the reaction to occur more quickly. It does not get consumed in the reaction and can be used repeatedly. Lipids, molecules, and proteins are not specifically known for their ability to accelerate chemical reactions.Rate this question:
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- 5.
Enzymes affect the reactions in living cells by changing the
- A.
Products of the reaction
- B.
Speed of the reaction
- C.
Temperature of the reaction
- D.
PH of the reaction
Correct Answer
B. Speed of the reactionExplanation
Enzymes act as catalysts in living cells, meaning they speed up chemical reactions without being consumed in the process. They achieve this by lowering the activation energy required for the reaction to occur. Therefore, enzymes directly affect the speed of the reaction, allowing it to occur more rapidly than it would without the enzyme. The other options, such as changing the products, temperature, or pH of the reaction, may indirectly influence the reaction speed but are not the primary role of enzymes in affecting reactions.Rate this question:
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- 6.
Without enzymes, the chemical reactions in the body would a. happen too fast. b. occur at much the same rate as they do with enzymes. c. require a different pH. d. occur too slowly to support life processes.
- A.
Happen too fast
- B.
Occur at much the same rate as they do with enzymes
- C.
Require a different pH
- D.
Occur too slowly to support life processes
Correct Answer
D. Occur too slowly to support life processesExplanation
Without enzymes, the chemical reactions in the body would occur too slowly to support life processes. Enzymes act as catalysts, speeding up the rate of chemical reactions in the body. They lower the activation energy required for a reaction to occur, allowing it to happen more quickly. Without enzymes, the reactions would proceed at a much slower rate, which would not be sufficient to sustain the necessary life processes.Rate this question:
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- 7.
Refer to the graph above. Reaction 3 in the graph
- A.
Probably occurred in the presence of a catalyst
- B.
Requires a greater activation energy than reaction 2
- C.
Is the same as reaction 1, but faster
- D.
Takes longer than reaction 2
Correct Answer
A. Probably occurred in the presence of a catalystExplanation
The graph suggests that reaction 3 occurred in the presence of a catalyst because it has a lower activation energy compared to reaction 2. A catalyst lowers the activation energy required for a reaction to occur, making it faster. The graph shows that reaction 3 has a lower activation energy than reaction 2, indicating that a catalyst was likely present.Rate this question:
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- 8.
Refer to the graph above. Which of these statements regarding the graph is true?
- A.
Reaction 2 occurs faster than reaction 3 because reaction 2 requires more energy than reaction 3
- B.
The difference in the graphs shown for reaction 2 and reaction 3 is due to a difference in the activation energy needed for these two reactions.
- C.
Reactant X contains more energy at the beginning of the reaction than product Z has after the reaction
- D.
All of the answer choices are correct
Correct Answer
B. The difference in the graphs shown for reaction 2 and reaction 3 is due to a difference in the activation energy needed for these two reactions.Explanation
The graph shows that reaction 2 has a higher activation energy barrier compared to reaction 3. This means that more energy is required for reaction 2 to proceed, resulting in a slower reaction rate. Therefore, the statement that "Reaction 2 occurs faster than reaction 3 because reaction 2 requires more energy than reaction 3" is incorrect. Instead, the correct statement is that the difference in the graphs is due to a difference in the activation energy needed for the two reactions.Rate this question:
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- 9.
Two students conduct an experiment in which they measure the concentration of an enzyme in a test tube at 1 minute intervals over the course of an enxymatic reaction. Each of the students makes a prediction about what will happen to the enzyme concentration as the reaction progresses. Student 1 predicts that the concentration of the enzyme in the test tube will decrease as the reaction progresses. Student 2 predicts that the concentration of the enzyme in the test tube will stay the same as the reaction progresses. Which student’s prediction is correct, and why?
- A.
Student 1; enzymes are depleted as a reaction progresses
- B.
Student 1; enzymes are not depleted as a reaction progresses
- C.
Student 2; enzymes are depleted as a reaction progresses
- D.
Student 2; enzymes are not depleted as a reaction progresses
Correct Answer
D. Student 2; enzymes are not depleted as a reaction progressesExplanation
Student 2's prediction is correct because enzymes are not depleted as a reaction progresses. Enzymes are catalysts that facilitate chemical reactions without being consumed in the process. They can be reused multiple times and remain unchanged at the end of the reaction. Therefore, the concentration of the enzyme in the test tube will stay the same as the reaction progresses.Rate this question:
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- 10.
When the pH in a stomach increases from 2 to 4, how does the hydrogen ion concentration change? a. It increases by a factor of 2. b. It increases by a factor of 100. c. It decreases by a factor of 2. d. It decreases by a factor of 100.
- A.
It increases by a factor of 2
- B.
It increases by a factor of 100
- C.
It decreases by a factor of 2
- D.
It decreases by a factor of 100
Correct Answer
D. It decreases by a factor of 100Explanation
When the pH in a stomach increases from 2 to 4, the hydrogen ion concentration decreases by a factor of 100. This is because pH is a measure of the concentration of hydrogen ions in a solution. As the pH increases, it indicates a decrease in the concentration of hydrogen ions. In this case, the increase in pH from 2 to 4 represents a decrease in the concentration of hydrogen ions by 100 times.Rate this question:
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- 11.
When the pH in a stomach decreases, what is happening?
- A.
H+ ions are increasing ONLY.
- B.
OH- ions are increasing ONLY.
- C.
H+ ions are decreasing ONLY.
- D.
OH- ions are decreasing ONLY.
- E.
H+ ions are increasing & OH- ions are decreasing.
- F.
H+ ions are decreasing & OH- ions are increasing.
Correct Answer
E. H+ ions are increasing & OH- ions are decreasing.Explanation
When the pH in a stomach decreases, it means that the concentration of hydrogen ions (H+) is increasing. At the same time, the concentration of hydroxide ions (OH-) is decreasing. This is because a decrease in pH indicates an increase in acidity, which is caused by an increase in the concentration of H+ ions. The decrease in OH- ions is a result of the increase in H+ ions, as they combine to form water (H2O). Therefore, the correct answer is that H+ ions are increasing and OH- ions are decreasing.Rate this question:
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- 12.
Which statement most accurately describes the induced fit model of enzyme function?
- A.
Substrate binding is not dependent upon the shape of the active site
- B.
Competitive inhibitors block the substrate from the active site
- C.
Substrate binding slightly changes the shape of the enzyme
- D.
An enzyme creates a permanent bond with the substrate
Correct Answer
C. Substrate binding slightly changes the shape of the enzymeExplanation
The induced fit model of enzyme function suggests that substrate binding causes a slight change in the shape of the enzyme. This change allows for a better fit between the enzyme and the substrate, enhancing the efficiency of the catalytic reaction. This model emphasizes the dynamic nature of enzyme-substrate interactions, where the active site is not rigid but can adapt to accommodate the substrate. This flexibility ensures that the enzyme can effectively bind to and catalyze the reaction with the substrate.Rate this question:
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- 13.
How do enzymes speed up chemical reactions?
- A.
By reducing activation energy
- B.
By reducing activation energy
- C.
By increasing activation energy
- D.
By increasing energy producted by the reaction
Correct Answer
A. By reducing activation energyExplanation
Enzymes speed up chemical reactions by reducing the activation energy required for the reaction to occur. Activation energy is the energy needed to initiate a chemical reaction. By lowering this energy barrier, enzymes allow reactions to happen more easily and quickly. They do this by binding to the reactant molecules and bringing them closer together, facilitating the formation of new bonds and the breaking of existing ones. This lowers the energy required for the reaction to proceed, making it more efficient.Rate this question:
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- 14.
The active site of an enzyme is
- A.
Where the reactant fits into the enzyme
- B.
Where the enzymes and molecule bond together
- C.
When the balance of living organisms affects the enzyme
- D.
The same shape in all enzymes
Correct Answer
A. Where the reactant fits into the enzymeExplanation
The active site of an enzyme is where the reactant fits into the enzyme. This is because enzymes are proteins that catalyze chemical reactions by binding to specific substrates at their active sites. The active site has a specific shape that allows it to bind with the reactant, forming an enzyme-substrate complex. This binding is essential for the enzyme to catalyze the reaction and facilitate the conversion of the reactant into the desired product. The specificity of the active site's shape ensures that enzymes can selectively bind to their specific substrates and carry out their biological functions effectively.Rate this question:
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- 15.
Which of the following factors affects enzyme activity?
- A.
Environmental factors
- B.
Cofactors (Coenzymes)
- C.
Enzyme Inhibitors
- D.
All of the answer choices are correct
Correct Answer
D. All of the answer choices are correctExplanation
All of the answer choices are correct because environmental factors such as temperature and pH can affect enzyme activity by altering the enzyme's shape and ability to bind to substrates. Cofactors, such as vitamins or metal ions, are necessary for some enzymes to function properly. Enzyme inhibitors can also affect enzyme activity by binding to the enzyme and preventing it from carrying out its normal function. Therefore, all of these factors can have an impact on enzyme activity.Rate this question:
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- 16.
Which of the following is the best definition for a substrate?
- A.
A reactant that an enzyme binds with to carry out a reaction
- B.
An enzyme that has an active site
- C.
A reactant that an active site acts on
- D.
None of the answer choices are correct
Correct Answer
A. A reactant that an enzyme binds with to carry out a reactionExplanation
A substrate is defined as a reactant that binds with an enzyme in order to facilitate and carry out a reaction. Enzymes have specific active sites where substrates bind, allowing the enzyme to catalyze the reaction. Therefore, the best definition for a substrate is a reactant that an enzyme binds with to carry out a reaction.Rate this question:
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- 17.
Which of the following is a characteristic of an enzyme?
- A.
They are specific
- B.
They are reusable
- C.
They are not permanently changed
- D.
All of the answer choices are correct
Correct Answer
D. All of the answer choices are correctExplanation
Enzymes are catalysts that speed up chemical reactions in the body. One of their characteristics is that they are specific, meaning they can only catalyze a particular reaction. They are also reusable, as they can be used over and over again in multiple reactions. Additionally, enzymes are not permanently changed during the reaction, meaning they can be used again for other reactions. Therefore, all of the given answer choices are correct in describing the characteristics of an enzyme.Rate this question:
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.png "Refer to the graph above. Which of these statements regarding the graph is true?")
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Current Version
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Mar 20, 2023Quiz Edited by
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Apr 17, 2013Quiz Created by
Jdowdyrobinson
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