Biology 148 Test 3 Questions with Correct Answers Latest Update 2025/2026
3 phosphate- ribose - A base - Answers Which one of these is ATP?
D. hydrolysis
-Hydrolysis involves breaking bonds with the addition of water. - Answers What type of reaction
breaks the bonds that join the phosphate groups in an ATP molecule?
A. dehydration synthesis
B. entropic
C. anabolism
D. hydrolysis
E. dehydration decomposition
C. γ-phosphate (the terminal phosphate)
-The γ-phosphate is the primary phosphate group on the ATP molecule that is hydrolyzed when
energy is needed to drive anabolic reactions. Located the farthest from the ribose sugar, it has a
higher energy than either the α- or β-phosphate. - Answers Which part of the adenosine
triphosphate molecule is released when it is hydrolyzed to provide energy for biological
reactions?
A. α -phosphate (the phosphate closest to ribose)
B. β-phosphate (the middle phosphate)
C. γ-phosphate (the terminal phosphate)
D. adenine group
E. ribose sugar
C. The activated substrate BP has higher free energy than substrate B.
-The higher free energy of activated substrate BP means that its reaction with A is exergonic,
whereas the reaction of B with A is endergonic. - Answers Which statement is correct
concerning the energetic coupling of reactions shown in Figure 8.9?
A. Products of the coupled reaction have lower free energy than products of the uncoupled
reaction.
B. Substrate A has higher free energy in the coupled versus the uncoupled reaction.
C. The activated substrate BP has higher free energy than substrate B.
,D. AB synthesis from A + BP is exergonic because phosphorylation of substrate B is exergonic.
D. They involve the transfer of electrons.
-Energy is transferred via electrons - Answers Which statement is true for all redox reactions?
A. An atom or molecule loses one or more electrons via reduction.
B. An atom or molecule gains one or more electrons via oxidation.
C. They involve the transfer of hydrogens.
D. They involve the transfer of electrons.
C. The reaction proceeds with a net release of free energy. - Answers Which of the following is
true for all exergonic reactions?
A. The products have more total energy than the reactants.
B. The reactions are rapid.
C. The reaction proceeds with a net release of free energy.
D. The reaction goes only in a forward direction: all reactants will be converted to products, but
no products will be converted to reactants.
E. A net input of energy from the surroundings is required for the reactions to proceed.
D. It provides energy coupling between exergonic and endergonic reactions. - Answers Why is
ATP an important molecule in metabolism?
A. Its terminal phosphate bond has higher energy than the other two phosphate bonds.
B. Its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases
free energy.
C. Its hydrolysis provides an input of free energy for exergonic reactions.
D. It provides energy coupling between exergonic and endergonic reactions.
D. It is one of the four building blocks for DNA synthesis.
A. electrons
- Reduction is the gain of an electron and oxidation is the loss of an electron. - Answers Redox
reactions involve the gain or loss of _____.
A. electrons
,B. phosphate
C. neutrons
D. protons
A. free energy is released
-ATP hydrolysis is exergonic. - Answers When ATP is hydrolyzed into ADP and inorganic
phosphate, _____.
A. free energy is released
B. a redox reaction has occurred
C. there is no change in free energy
D. free energy is required
D. glycolysis
-Glycolysis occurs in the cytosol. - Answers What process occurs in Box A? (Glucose -> pyruvate
in the cytosol)
A. electron transport
B. electron transport and oxidative phosphorylation
C. oxidative phosphorylation
D. glycolysis
E. the citric acid cycle
D. the citric acid cycle
-The citric acid cycle transfers electrons to NADH and FADH2. - Answers What process occurs
within Box B? (Inside mitochondria- in a circle)
A. oxidative phosphorylation
B. electron transport
C. photophosphorylation
D. the citric acid cycle
E. glycolysis
C. Citric acid cycle: (1) Acetyl CoA; (2) NADH, ATP (or GTP), FADH2,, and CO2 - Answers Which
, answer correctly associates a process in cellular respiration with (1) what goes in and (2) what
comes out?
A. Citric acid cycle: (1) Acetyl CoA, CO2; (2) NADH, ATP (or GTP), and FADH2
B. Pyruvate processing: (1) Acetyl CoA; (2) Pyruvate, NADH, and CO2.
C. Citric acid cycle: (1) Acetyl CoA; (2) NADH, ATP (or GTP), FADH2,, and CO2
D. Glycolysis: (1) Glucose, NADH; (2) Pyruvate
C. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
Therefore, glycolysis CANNOT function without NAD+. NAD+ CANNOT donate electrons for use
in oxidative phosphorylation. NAD+ DOES NOT have more chemical energy than NADH. NAD+ IS
NOT oxidized by the action of hydrogenases. - Answers Which of the following statements
about NAD+ is true?
A. In the absence of NAD+, glycolysis can still function.
B. NAD+ can donate electrons for use in oxidative phosphorylation.
C. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
D. NAD+ has more chemical energy than NADH.
E. NAD+ is oxidized by the action of hydrogenases.
D. glycolysis, pyruvate processing, citric acid cycle, electron transport, oxidative phosphorylation
- Answers What is the correct sequence of steps in cellular respiration, starting with glucose?
A. glycolysis, pyruvate processing, citric acid cycle, fermentation
B. glycolysis, citric acid cycle, pyruvate processing, electron transport, oxidative
phosphorylation
C. glycolysis, citric acid cycle, electron transport, oxidative phosphorylation, fermentation
D. glycolysis, pyruvate processing, citric acid cycle, electron transport, oxidative
phosphorylation
B. glucose is oxidized and there is net production of ATP
-Respiration harnesses the energy from the oxidation of high-energy molecules to produce ATP.
- Answers During cellular respiration ____.
A. glucose is reduced and there is net hydrolysis of ATP
3 phosphate- ribose - A base - Answers Which one of these is ATP?
D. hydrolysis
-Hydrolysis involves breaking bonds with the addition of water. - Answers What type of reaction
breaks the bonds that join the phosphate groups in an ATP molecule?
A. dehydration synthesis
B. entropic
C. anabolism
D. hydrolysis
E. dehydration decomposition
C. γ-phosphate (the terminal phosphate)
-The γ-phosphate is the primary phosphate group on the ATP molecule that is hydrolyzed when
energy is needed to drive anabolic reactions. Located the farthest from the ribose sugar, it has a
higher energy than either the α- or β-phosphate. - Answers Which part of the adenosine
triphosphate molecule is released when it is hydrolyzed to provide energy for biological
reactions?
A. α -phosphate (the phosphate closest to ribose)
B. β-phosphate (the middle phosphate)
C. γ-phosphate (the terminal phosphate)
D. adenine group
E. ribose sugar
C. The activated substrate BP has higher free energy than substrate B.
-The higher free energy of activated substrate BP means that its reaction with A is exergonic,
whereas the reaction of B with A is endergonic. - Answers Which statement is correct
concerning the energetic coupling of reactions shown in Figure 8.9?
A. Products of the coupled reaction have lower free energy than products of the uncoupled
reaction.
B. Substrate A has higher free energy in the coupled versus the uncoupled reaction.
C. The activated substrate BP has higher free energy than substrate B.
,D. AB synthesis from A + BP is exergonic because phosphorylation of substrate B is exergonic.
D. They involve the transfer of electrons.
-Energy is transferred via electrons - Answers Which statement is true for all redox reactions?
A. An atom or molecule loses one or more electrons via reduction.
B. An atom or molecule gains one or more electrons via oxidation.
C. They involve the transfer of hydrogens.
D. They involve the transfer of electrons.
C. The reaction proceeds with a net release of free energy. - Answers Which of the following is
true for all exergonic reactions?
A. The products have more total energy than the reactants.
B. The reactions are rapid.
C. The reaction proceeds with a net release of free energy.
D. The reaction goes only in a forward direction: all reactants will be converted to products, but
no products will be converted to reactants.
E. A net input of energy from the surroundings is required for the reactions to proceed.
D. It provides energy coupling between exergonic and endergonic reactions. - Answers Why is
ATP an important molecule in metabolism?
A. Its terminal phosphate bond has higher energy than the other two phosphate bonds.
B. Its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases
free energy.
C. Its hydrolysis provides an input of free energy for exergonic reactions.
D. It provides energy coupling between exergonic and endergonic reactions.
D. It is one of the four building blocks for DNA synthesis.
A. electrons
- Reduction is the gain of an electron and oxidation is the loss of an electron. - Answers Redox
reactions involve the gain or loss of _____.
A. electrons
,B. phosphate
C. neutrons
D. protons
A. free energy is released
-ATP hydrolysis is exergonic. - Answers When ATP is hydrolyzed into ADP and inorganic
phosphate, _____.
A. free energy is released
B. a redox reaction has occurred
C. there is no change in free energy
D. free energy is required
D. glycolysis
-Glycolysis occurs in the cytosol. - Answers What process occurs in Box A? (Glucose -> pyruvate
in the cytosol)
A. electron transport
B. electron transport and oxidative phosphorylation
C. oxidative phosphorylation
D. glycolysis
E. the citric acid cycle
D. the citric acid cycle
-The citric acid cycle transfers electrons to NADH and FADH2. - Answers What process occurs
within Box B? (Inside mitochondria- in a circle)
A. oxidative phosphorylation
B. electron transport
C. photophosphorylation
D. the citric acid cycle
E. glycolysis
C. Citric acid cycle: (1) Acetyl CoA; (2) NADH, ATP (or GTP), FADH2,, and CO2 - Answers Which
, answer correctly associates a process in cellular respiration with (1) what goes in and (2) what
comes out?
A. Citric acid cycle: (1) Acetyl CoA, CO2; (2) NADH, ATP (or GTP), and FADH2
B. Pyruvate processing: (1) Acetyl CoA; (2) Pyruvate, NADH, and CO2.
C. Citric acid cycle: (1) Acetyl CoA; (2) NADH, ATP (or GTP), FADH2,, and CO2
D. Glycolysis: (1) Glucose, NADH; (2) Pyruvate
C. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
Therefore, glycolysis CANNOT function without NAD+. NAD+ CANNOT donate electrons for use
in oxidative phosphorylation. NAD+ DOES NOT have more chemical energy than NADH. NAD+ IS
NOT oxidized by the action of hydrogenases. - Answers Which of the following statements
about NAD+ is true?
A. In the absence of NAD+, glycolysis can still function.
B. NAD+ can donate electrons for use in oxidative phosphorylation.
C. NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
D. NAD+ has more chemical energy than NADH.
E. NAD+ is oxidized by the action of hydrogenases.
D. glycolysis, pyruvate processing, citric acid cycle, electron transport, oxidative phosphorylation
- Answers What is the correct sequence of steps in cellular respiration, starting with glucose?
A. glycolysis, pyruvate processing, citric acid cycle, fermentation
B. glycolysis, citric acid cycle, pyruvate processing, electron transport, oxidative
phosphorylation
C. glycolysis, citric acid cycle, electron transport, oxidative phosphorylation, fermentation
D. glycolysis, pyruvate processing, citric acid cycle, electron transport, oxidative
phosphorylation
B. glucose is oxidized and there is net production of ATP
-Respiration harnesses the energy from the oxidation of high-energy molecules to produce ATP.
- Answers During cellular respiration ____.
A. glucose is reduced and there is net hydrolysis of ATP
