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BIOL 110 Unit III Quiz 1: Energy &
Enzymes Review Questions with
100% accurate solutions
1. If one continues to increase the temperature in an enzymecatalyzed
reaction, the enzyme activity:
1. increases and then decreases rapidly. ✅
Explanation: Enzyme activity increases with temperature until it reaches
the enzyme’s optimal temperature. Beyond that point, the enzyme begins
to denature, and activity drops rapidly.
2. The reactant (substance) on which an enzyme acts is called the:
1. substrate. ✅
Explanation: A substrate is the molecule that binds to the enzyme’s active
site to undergo a chemical reaction.
3. Parts of the enzyme molecule that interact with a substrate are
called_______ sites:
1. active ✅
Explanation: The active site is the region on the enzyme where the
substrate binds and the reaction occurs.
4. Is true about enzymes:
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1. lower the activation energy of a biochemical reaction. ✅
Explanation: Enzymes speed up biochemical reactions by lowering the
activation energy, which is the minimum amount of energy required for a
reaction to occur. They do not change the overall energy of the reactants or
products; instead, they make it easier for molecules to react by stabilizing
the transition state.
5. The ultimate source of energy for almost all living organisms is:
1. the sun. ✅
Explanation: The sun provides the original source of energy that drives
photosynthesis, supplying energy to nearly all living systems.
6. Entropy is the measure of what?
1. Increase of randomness ✅
Explanation: Entropy measures disorder or randomness. In natural
processes, entropy tends to increase.
7. Reactions that build larger molecules from smaller ones:
1. anabolic reactions. ✅
Explanation: Anabolic reactions build larger molecules from smaller ones
and require an input of energy, making them endergonic. Catabolic
reactions break down molecules and release energy.
8. Metabolism is:
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1. All the chemical reactions that occur in an organism….✅
Explanation: Metabolism includes all the chemical reactions that occur in
an organism, including both anabolic (building) and catabolic (breaking
down) reactions.
9. In order for a cell to maintain a high degree of order, it must:
1. have a constant input of energy from the surroundings. ✅
Explanation: Cells maintain organization and low entropy by taking in
energy from their surroundings, such as sunlight or food molecules.
10. Which of the following does not represent a method by which cells
regulate enzyme activity?
1. heat denaturation of the enzyme ✅
Explanation: Cells regulate enzymes through allosteric control, feedback
inhibition, and adjusting enzyme production. Heat denaturation is not a
regulation method—it’s a form of damage that destroys enzyme activity.
11. Which of the following statements concerning enzymes is false?
1. It forms enzyme-product complex. ✅
Explanation: Enzymes form an enzyme-substrate complex, not an
enzyme-product complex.
12. A chemical reaction in which free energy of the products is greater
than the free energy of the reactants is called ________ (No image,
image for reference)
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BIOL 110 Unit III Quiz 1: Energy &
Enzymes Review Questions with
100% accurate solutions
1. If one continues to increase the temperature in an enzymecatalyzed
reaction, the enzyme activity:
1. increases and then decreases rapidly. ✅
Explanation: Enzyme activity increases with temperature until it reaches
the enzyme’s optimal temperature. Beyond that point, the enzyme begins
to denature, and activity drops rapidly.
2. The reactant (substance) on which an enzyme acts is called the:
1. substrate. ✅
Explanation: A substrate is the molecule that binds to the enzyme’s active
site to undergo a chemical reaction.
3. Parts of the enzyme molecule that interact with a substrate are
called_______ sites:
1. active ✅
Explanation: The active site is the region on the enzyme where the
substrate binds and the reaction occurs.
4. Is true about enzymes:
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1. lower the activation energy of a biochemical reaction. ✅
Explanation: Enzymes speed up biochemical reactions by lowering the
activation energy, which is the minimum amount of energy required for a
reaction to occur. They do not change the overall energy of the reactants or
products; instead, they make it easier for molecules to react by stabilizing
the transition state.
5. The ultimate source of energy for almost all living organisms is:
1. the sun. ✅
Explanation: The sun provides the original source of energy that drives
photosynthesis, supplying energy to nearly all living systems.
6. Entropy is the measure of what?
1. Increase of randomness ✅
Explanation: Entropy measures disorder or randomness. In natural
processes, entropy tends to increase.
7. Reactions that build larger molecules from smaller ones:
1. anabolic reactions. ✅
Explanation: Anabolic reactions build larger molecules from smaller ones
and require an input of energy, making them endergonic. Catabolic
reactions break down molecules and release energy.
8. Metabolism is:
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1. All the chemical reactions that occur in an organism….✅
Explanation: Metabolism includes all the chemical reactions that occur in
an organism, including both anabolic (building) and catabolic (breaking
down) reactions.
9. In order for a cell to maintain a high degree of order, it must:
1. have a constant input of energy from the surroundings. ✅
Explanation: Cells maintain organization and low entropy by taking in
energy from their surroundings, such as sunlight or food molecules.
10. Which of the following does not represent a method by which cells
regulate enzyme activity?
1. heat denaturation of the enzyme ✅
Explanation: Cells regulate enzymes through allosteric control, feedback
inhibition, and adjusting enzyme production. Heat denaturation is not a
regulation method—it’s a form of damage that destroys enzyme activity.
11. Which of the following statements concerning enzymes is false?
1. It forms enzyme-product complex. ✅
Explanation: Enzymes form an enzyme-substrate complex, not an
enzyme-product complex.
12. A chemical reaction in which free energy of the products is greater
than the free energy of the reactants is called ________ (No image,
image for reference)
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