Thhs Bio- Enzyme Quiz
Questions and Answers
- 1.
Since light can speed up the rate at which hydrogen peroxide is broken down into water and oxygen, peroxide is kept in an opaque bottle. Light is therefore a catalyst. However, light is not an enzyme.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given statement is true. Light can speed up the decomposition of hydrogen peroxide, but it does not meet the criteria to be classified as an enzyme. Enzymes are biological catalysts that are usually proteins, whereas light is a form of energy. Therefore, while light can act as a catalyst in certain chemical reactions, it is not an enzyme.Rate this question:
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- 2.
The enzyme and substrate in the Lock and Key Model depicted below
- A.
Have a specific shape related to their interaction with each other
- B.
Have a shape that can change slightly
- C.
Meet up at the enzyme substrate corner
- D.
Are not affected by denaturation of the enzyme
Correct Answer
A. Have a specific shape related to their interaction with each otherExplanation
The Lock and Key Model suggests that enzymes and substrates have a specific shape that is complementary to each other. This means that the enzyme and substrate fit together like a lock and key, allowing for a specific interaction to occur. This specific shape is important for the enzyme to catalyze the reaction effectively. If the shape of either the enzyme or substrate changes significantly, they may no longer fit together properly, and the reaction may not occur. Therefore, the specific shape of the enzyme and substrate is crucial for their interaction and the functioning of the enzyme.Rate this question:
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- 3.
Check all of the choices below that are enzymes:
- A.
Lipase
- B.
Salivary amylase
- C.
Pepsin
- D.
Trypsin
- E.
Lactase
- F.
Luciferose
- G.
Ribosome
Correct Answer(s)
A. Lipase
B. Salivary amylase
C. Pepsin
D. Trypsin
E. LactaseExplanation
Lipase, Salivary amylase, Pepsin, Trypsin, and Lactase are all enzymes. Enzymes are proteins that act as catalysts in biological reactions, speeding up the rate of chemical reactions without being consumed in the process. Lipase is an enzyme that breaks down lipids, Salivary amylase breaks down starches into sugars, Pepsin is involved in the digestion of proteins, Trypsin is another protein-digesting enzyme, and Lactase breaks down lactose, a sugar found in milk. Luciferase and Ribosome are not enzymes.Rate this question:
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- 4.
Adding an acidic solution like orange juice to a bowl of cut-up apples will slow down the browning of the apples because
- A.
The acidic solution contains hydrochloric acid which kills bacteria
- B.
The acidic solution protects the apple
- C.
The acidic solution denatures the enzyme which causes the apple to brown
- D.
Choices A. and B.
Correct Answer
C. The acidic solution denatures the enzyme which causes the apple to brownExplanation
The correct answer is that the acidic solution denatures the enzyme which causes the apple to brown. When apples are cut, an enzyme called polyphenol oxidase is exposed to oxygen in the air, causing the apple to brown. The acidic solution, like orange juice, changes the pH of the apple's surface, which denatures or changes the shape of the enzyme. This change in shape prevents the enzyme from functioning properly, slowing down the browning process. The presence of hydrochloric acid or the protection of the apple are not the reasons for the slowdown in browning.Rate this question:
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- 5.
A basic solution has a pH between 8-14. Since the pH of bleach is 13, it is considered a basic solution.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A basic solution is defined as having a pH value greater than 7. The pH scale ranges from 0 to 14, with values below 7 indicating acidity and values above 7 indicating basicity. Since the pH of bleach is 13, which falls within the range of 8-14 for basic solutions, it can be concluded that bleach is indeed a basic solution.Rate this question:
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- 6.
An appropriate caption for this figure would be
- A.
How Enzymes Work: The Lock and Key Model
- B.
The Role of Temperature on Enzyme Action
- C.
The Role of pH on Enzyme Action
- D.
How Enzymes Function: The Induced Fit Model
Correct Answer
D. How Enzymes Function: The Induced Fit ModelExplanation
The appropriate caption for this figure would be "How Enzymes Function: The Induced Fit Model". This caption accurately describes the content of the figure, which likely illustrates the concept of the induced fit model of enzyme action. The induced fit model explains how enzymes undergo conformational changes upon binding to their substrates, allowing for optimal binding and catalysis.Rate this question:
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- 7.
The product shown below is a lactase substitute. Someone may take pills or a formula containing lactase if they
- A.
Do not have the lactase gene
- B.
Have a mutated lactase gene
- C.
Produce lactase that has a distorted shape
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
This lactase substitute is used by individuals who do not have the lactase gene, have a mutated lactase gene, or produce lactase that has a distorted shape. This product can help these individuals break down lactose, the sugar found in dairy products, and prevent symptoms of lactose intolerance.Rate this question:
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- 8.
In the graph shown below, increasing the substrate concentration does not increase the rate of reaction at a certain point because
- A.
All of the enzymes are occupied with substrates
- B.
All of the enzymes have been denatured
- C.
A and B
- D.
None of the above
Correct Answer
A. All of the enzymes are occupied with substratesExplanation
Increasing the substrate concentration does not increase the rate of reaction at a certain point because all of the enzymes are already occupied with substrates. This means that there are no available enzymes to bind with additional substrates, leading to a plateau in the reaction rate.Rate this question:
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- 9.
An enzyme uses hydrolysis to break down a complex carbohydrate. The products of the reaction will be
- A.
Lipids
- B.
Simple sugars
- C.
Amino acids
- D.
Nucleic acids
Correct Answer
B. Simple sugarsExplanation
When an enzyme uses hydrolysis to break down a complex carbohydrate, it breaks the bonds between the sugar molecules in the carbohydrate. This results in the formation of simple sugars as the products of the reaction. Simple sugars, also known as monosaccharides, are the basic building blocks of carbohydrates and can be easily absorbed and utilized by the body for energy. Lipids, amino acids, and nucleic acids are not the products of hydrolysis of complex carbohydrates.Rate this question:
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- 10.
Why would trypsin, an enzyme that hydrolyzes proteins, denature if placed in the stomach? Check all that apply.
- A.
Trypsin functions best in a basic environment.
- B.
The stomach has a higher temperature than the rest of the body.
- C.
The stomach has an acidic environment.
- D.
Pepsin competes with trypsin for substrates.
Correct Answer(s)
A. Trypsin functions best in a basic environment.
C. The stomach has an acidic environment.Explanation
Trypsin is an enzyme that functions best in a basic (alkaline) environment. The stomach, on the other hand, has an acidic environment due to the presence of hydrochloric acid. This acidic environment can denature or inactivate trypsin, causing it to lose its enzymatic activity. Therefore, trypsin would denature if placed in the stomach.Rate this question:
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- 11.
According to the induced-fit hypothesis, the active site of an enzyme
Correct Answer(s)
is rigid and inflexible
is precisely tailored to fit a substrate perfectly
may change its shape to fit a particular substrate
binds to any substrateExplanation
The induced-fit hypothesis suggests that the active site of an enzyme may change its shape to fit a particular substrate. This means that the active site is not rigid and inflexible, but rather flexible and dynamic. The enzyme can undergo conformational changes to accommodate the substrate, allowing for a more precise fit. However, this does not mean that the active site binds to any substrate. It is still specific and tailored to fit a particular substrate, but it can adapt its shape to optimize the interaction with that substrate.Rate this question:
- 12.
The molecules that enzymes combine with and convert into other molecules are called substrates.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Enzymes are biological catalysts that facilitate chemical reactions in living organisms. They bind to specific molecules called substrates and convert them into different molecules. This process is known as enzymatic catalysis. Therefore, the statement that the molecules that enzymes combine with and convert into other molecules are called substrates is true.Rate this question:
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- 13.
Which of the following enzymes would digest a fat?
- A.
Protease
- B.
Fatase
- C.
Lactase
- D.
Lipase
Correct Answer
D. LipaseExplanation
Lipase is the correct answer because it is an enzyme that specifically breaks down fats. Protease is an enzyme that digests proteins, lactase is an enzyme that digests lactose (a sugar found in milk), and fatase is not a known enzyme. Therefore, lipase is the only enzyme listed that would be able to digest a fat.Rate this question:
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- 14.
Enzymes influence chemical reactions in living systems by
- A.
Providing the substrate required for the reaction to occur
- B.
Affecting the rate at which reactions occur
- C.
Absorbing water released when polymers are formed
- D.
Combining with excess hydrogen to form gaseous wastes
Correct Answer
B. Affecting the rate at which reactions occurExplanation
Enzymes are biological catalysts that speed up chemical reactions in living systems. They do this by lowering the activation energy required for the reaction to occur, thus increasing the rate at which the reaction takes place. Enzymes achieve this by binding to specific substrates and bringing them together in the correct orientation, allowing the reaction to proceed more quickly. Therefore, the correct answer is "affecting the rate at which reactions occur."Rate this question:
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- 15.
Which group of organic compounds includes the enzymes?
- A.
Proteins
- B.
Starches
- C.
Carbs
- D.
Lipids
- E.
Nucleic acids
Correct Answer
A. ProteinsExplanation
Proteins are the group of organic compounds that include enzymes. Enzymes are a type of protein that act as catalysts in biochemical reactions, speeding up the rate of these reactions. Proteins are composed of amino acids and are involved in various biological processes, such as metabolism, growth, and repair. Other options like starches, carbs, lipids, and nucleic acids do not include enzymes. Starches and carbs are types of carbohydrates, lipids are fats, and nucleic acids are involved in genetic information storage and transfer.Rate this question:
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- 16.
The optimum temperature for the action of this enzyme is approximately
- A.
15 C
- B.
22 C
- C.
37 C
- D.
50 C
Correct Answer
C. 37 CExplanation
The optimum temperature for the action of this enzyme is 37°C. Enzymes are proteins that catalyze biochemical reactions and their activity is highly influenced by temperature. At temperatures below the optimum, the enzyme's activity is low as the rate of reaction is slow. As the temperature increases towards the optimum, the enzyme's activity also increases until it reaches its maximum rate at the optimum temperature. Beyond the optimum temperature, the enzyme's structure starts to denature, leading to a decrease in activity. Therefore, 37°C is the temperature at which this enzyme functions most efficiently.Rate this question:
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- 17.
- A.
A molecule of oxygen
- B.
An end product
- C.
An organic catalyst
- D.
The substrate
Correct Answer
C. An organic catalyst -
- 18.
How will the rate of the reaction change if the temperature is raised to 50 degrees Cesius?
- A.
The reaction rate will increase.
- B.
The reaction rate will decrease.
Correct Answer
B. The reaction rate will decrease.Explanation
When the temperature is raised, the kinetic energy of the reactant molecules increases, leading to more frequent and energetic collisions between them. This results in a higher reaction rate. However, the given answer contradicts this. Therefore, the correct answer should be that the reaction rate will increase, not decrease.Rate this question:
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- 19.
In order for this firefly to produce light without heat, the following must be present:
- A.
Oxygen, luciferase, and luciferose
- B.
ATP and luciferase
- C.
ATP, luciferase, oxygen
- D.
Luciferase, oxygen, luciferin, ATP
Correct Answer
D. Luciferase, oxygen, luciferin, ATPExplanation
The firefly produces light through a chemical reaction called bioluminescence. Luciferase is an enzyme that catalyzes this reaction, luciferin is the substrate that is converted into a light-emitting molecule, and ATP provides the necessary energy for the reaction to occur. Oxygen is also required for the reaction to take place. Therefore, all four components - luciferase, oxygen, luciferin, and ATP - must be present for the firefly to produce light without heat.Rate this question:
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- 20.
Why do fireflies bioluminesce?
- A.
To attract mates
- B.
Because owl city says so
- C.
Because of nothing
- D.
To attract predators
Correct Answer
A. To attract matesExplanation
Fireflies bioluminesce to attract mates. Bioluminescence is a form of communication used by fireflies to signal their presence and availability for reproduction. The flashing light patterns emitted by male fireflies are unique to each species, allowing females to identify and locate potential mates. This behavior plays a crucial role in their reproductive success and is a fascinating example of nature's intricate mechanisms for species survival.Rate this question:
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