Ch 6 Energy & Enzyme Quiz
Enzymes are not consumed in a reaction, but they are catalysts
that allow the reaction to proceed at a faster rate. This therefore
means they produce energy needed for a reaction. Take up the
quiz below and test your understanding of chapter Ch. 6 on energy
& Enzymes. All the best!
- 1.
Endergonic reactions
- A.
Are always coupling reactions.
- B.
Have a negative DG and occur spontaneously.
- C.
Can only occur if there is an input of energy.
- D.
Have products with less free energy than the reactants.
- E.
All of the above are correct.
Correct Answer
C. Can only occur if there is an input of energy.Explanation
Endergonic reactions require an input of energy in order to occur. This is because these reactions involve the formation of products with higher free energy than the reactants. Therefore, the correct answer is that endergonic reactions can only occur if there is an input of energy.Rate this question:
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- 2.
Coupling occurs when the energy released by an exergonic reaction is
- A.
Used to drive another exergonic reaction.
- B.
Used to drive an endergonic reaction.
- C.
Lost as nonusable heat to the environment.
- D.
Used to decrease the entropy of the universe.
- E.
All of the above are correct.
Correct Answer
B. Used to drive an endergonic reaction.Explanation
Coupling occurs when the energy released by an exergonic reaction is used to drive an endergonic reaction. This means that the energy produced from the exergonic reaction is harnessed and utilized to power the endergonic reaction, which would not occur spontaneously on its own. This coupling of reactions allows for the overall energy balance to be maintained and for the endergonic reaction to proceed. The other options are incorrect because they do not accurately describe the concept of coupling.Rate this question:
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- 3.
Which of the following is characteristic of enzymes?
- A.
They lower the energy of activation of a reaction by binding the substrate.
- B.
They raise the energy of activation of a reaction by binding the substrate.
- C.
They lower the amount of energy present in the substrate.
- D.
They raise the amount of energy present in the substrate.
Correct Answer
A. They lower the energy of activation of a reaction by binding the substrate.Explanation
Enzymes are known to lower the energy of activation of a reaction by binding the substrate. This means that enzymes facilitate the reaction by reducing the amount of energy required for it to occur. By binding to the substrate, enzymes create a favorable environment for the reaction to take place, allowing it to proceed at a faster rate. This characteristic of enzymes is essential for their role in catalyzing biochemical reactions in living organisms.Rate this question:
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- 4.
An enzyme is generally named by adding _____ to the end of the name of the ______.
- A.
"-ose," cell in which it is found
- B.
"-ase," cell in which it is found
- C.
"-ose," substrate
- D.
"-ase," substrate
- E.
"-ase," coenzyme
Correct Answer
D. "-ase," substrateExplanation
Enzymes are generally named by adding "-ase" to the end of the name of the substrate. This naming convention helps to identify the specific reaction that the enzyme catalyzes. The substrate is the molecule that the enzyme acts upon, so including it in the enzyme's name helps to indicate its function. The other options, "-ose" and "-ase" followed by the cell in which the enzyme is found or a coenzyme, are not commonly used naming conventions for enzymes.Rate this question:
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- 5.
Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?
- A.
As the product is released, the enzyme breaks down.
- B.
The enzyme is like a key that fits into the substrate, which is like a lock.
- C.
The active site is permanently changed by its interaction with the substrate.
- D.
As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
Correct Answer
D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.Explanation
The currently accepted theory of how an enzyme and its substrate fit together is that as the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction. This means that the enzyme and substrate have a complementary shape, similar to a lock and key, and the active site adjusts to create an optimal environment for the reaction to occur. This theory explains how enzymes are able to catalyze specific reactions and increase the rate of chemical reactions in living organisms.Rate this question:
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- 6.
A coenzyme is
- A.
An ionic cofactor that interacts with an enzyme to allow it to work.
- B.
A protein cofactor that interacts with an enzyme to allow it to work.
- C.
A nonprotein organic cofactor that interacts with an enzyme to allow it to work.
- D.
An ionic cofactor that interacts with an enzyme to inhibit it.
- E.
A protein cofactor that interacts with an enzyme to inhibit it.
Correct Answer
C. A nonprotein organic cofactor that interacts with an enzyme to allow it to work.Explanation
A coenzyme is a nonprotein organic cofactor that interacts with an enzyme to allow it to work. Unlike protein cofactors, which are usually proteins themselves, coenzymes are small, nonprotein molecules that bind to enzymes and assist in catalyzing reactions. Coenzymes often act as carriers of specific functional groups or electrons, enabling enzymes to perform their functions effectively. Examples of coenzymes include NAD+, FAD, and coenzyme A.Rate this question:
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- 7.
Which organelles contain functioning ATP synthetase complexes in their membranes?
- A.
Golgi complexes and lysosomes
- B.
Mitochondria and chloroplasts
- C.
Endoplasmic reticulum and vesicles
- D.
Vacuoles and vesicles
- E.
Mitochondria and endoplasmic reticulum
Correct Answer
B. Mitochondria and chloroplastsExplanation
Mitochondria and chloroplasts are the correct answer because both organelles contain functioning ATP synthetase complexes in their membranes. ATP synthetase is an enzyme that plays a crucial role in the production of ATP, the main energy currency of cells. In mitochondria, ATP synthetase is located in the inner mitochondrial membrane, while in chloroplasts, it is found in the thylakoid membrane. These organelles are known as the powerhouses of the cell because they are responsible for generating energy through cellular respiration and photosynthesis, respectively.Rate this question:
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- 8.
Since energy is completely used up by a cell, the cell requires more energy to enter it in the form of food.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because cells do not completely use up energy. Instead, they convert energy from one form to another through metabolic processes. Cells obtain energy from food molecules and convert it into a usable form called ATP. This ATP is then used to fuel various cellular activities. Therefore, cells do not require more energy to enter in the form of food, but rather they require a constant supply of energy to sustain their functions.Rate this question:
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- 9.
All organisms produce heat during their metabolic processes.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
All organisms produce heat as a byproduct of their metabolic processes. This heat is generated through various biochemical reactions that occur within cells. These reactions involve the breakdown of nutrients to release energy, which is then used by the organism for various functions such as growth, movement, and reproduction. The production of heat is a fundamental characteristic of living organisms and is essential for maintaining their internal body temperature. Therefore, the statement that all organisms produce heat during their metabolic processes is true.Rate this question:
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- 10.
The ultimate source of nearly all the energy that is used to support life is sunlight.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that sunlight is the ultimate source of energy for almost all living organisms on Earth. Through the process of photosynthesis, plants and some other organisms convert sunlight into chemical energy, which is then passed on to other organisms through the food chain. This energy is crucial for the survival and functioning of all living things, making sunlight the primary source of energy in most ecosystems.Rate this question:
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- 11.
The energy of activation is the energy that must be supplied so that molecules are able to interact with each other in a chemical reaction.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that the energy of activation is indeed the energy required for molecules to interact in a chemical reaction. This energy is needed to overcome the energy barrier between reactants and products and initiate the reaction. Without the energy of activation, the molecules would not have enough energy to overcome this barrier and the reaction would not occur. Therefore, it is true that the energy of activation is necessary for molecules to interact in a chemical reaction.Rate this question:
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Mar 22, 2023Quiz Edited by
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Sep 30, 2008Quiz Created by
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