CHEM 210
OBJECTIVE ASSESSMENT - EXAM
BioChem 210
Module 7 Exam (2026/2027)
Portage Learning | Bioenergetics and Metabolic Pathways: Part I
50 100%
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Glycolysis & Glucose Metabolism Electron Transport Chain
Citric Acid Cycle (CAC) ATP Synthase & Chemiosmosis
Fatty Acid Beta-Oxidation Metabolic Regulation & Flux
COVER PAGE - 1
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 1 of 48
, SECTION 1 | Bioenergetics and Thermodynamics | Q1-Q10 | BioChem 210 2026/2027
Q1 Question 1 of 50
Q1. A biochemistry student measures the Gibbs free energy change for a reaction
and finds Delta G = -45 kJ/mol at standard conditions. The student concludes this
reaction will proceed spontaneously under cellular conditions. Which
thermodynamic principle best supports this conclusion?
A. A negative Delta G indicates the reaction releases free energy and is exergonic,
favoring spontaneity.
B. A negative Delta G means the reaction requires an input of heat energy to proceed.
C. The reaction must have a positive enthalpy change to compensate for the negative free
energy.
D. A negative Delta G only applies at temperatures above 37 degrees Celsius.
Correct Answer: A
Rationale:
A negative Delta G indicates the reaction is exergonic, meaning it releases free energy and proceeds spontaneously
without external energy input. Choice B incorrectly describes endergonic reactions. Choice C is wrong because
negative Delta G can occur with either positive or negative enthalpy depending on entropy. Choice D is incorrect
because Delta G applies at any temperature where measured.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 2 of 48
,Q2 Question 2 of 50
Q2. During a laboratory experiment, a researcher observes that ATP hydrolysis to
ADP and inorganic phosphate releases approximately -30.5 kJ/mol under standard
conditions. The researcher wants to understand why this reaction is so favorable.
What structural feature of ATP primarily contributes to this large negative free
energy change?
A. The electrostatic repulsion between the three negatively charged phosphate groups
and the greater resonance stabilization of the products.
B. The presence of a high-energy carbon-carbon double bond within the adenine ring.
C. The covalent bond between the ribose sugar and the adenine base being easily broken.
D. The hydrogen bonding between the phosphate groups and surrounding water molecules.
Correct Answer: A
Rationale:
ATP's high phosphoryl transfer potential arises from electrostatic repulsion between adjacent negatively charged
phosphate groups and the greater resonance stabilization of ADP and Pi compared to ATP. Choice B is incorrect
because adenine lacks a high-energy double bond relevant to hydrolysis. Choice C describes a glycosidic bond
unrelated to ATP hydrolysis energy. Choice D describes hydration, not the thermodynamic driving force.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 3 of 48
, Q3 Question 3 of 50
Q3. In a cellular assay, a metabolic pathway is found to have a flux rate of 5.2
micromoles per minute. The investigator explains that flux represents the overall
throughput of metabolites. Which statement accurately describes metabolic flux in
the context of this pathway?
A. Flux is the rate of flow through a biochemical pathway, reflecting how quickly
substrates are converted to products under given conditions.
B. Flux is the total concentration of all enzymes present in the pathway at any given moment.
C. Flux represents the equilibrium constant of the rate-limiting step in the pathway.
D. Flux is defined as the sum of all individual reaction rates divided by the number of steps.
Correct Answer: A
Rationale:
Metabolic flux is correctly defined as the rate of metabolite flow through a pathway, measured in units like micromoles
per minute. Choice B confuses flux with enzyme concentration. Choice C incorrectly equates flux with an equilibrium
constant. Choice D presents a nonsensical calculation that does not correspond to any biochemical definition of flux.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 4 of 48
OBJECTIVE ASSESSMENT - EXAM
BioChem 210
Module 7 Exam (2026/2027)
Portage Learning | Bioenergetics and Metabolic Pathways: Part I
50 100%
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Glycolysis & Glucose Metabolism Electron Transport Chain
Citric Acid Cycle (CAC) ATP Synthase & Chemiosmosis
Fatty Acid Beta-Oxidation Metabolic Regulation & Flux
COVER PAGE - 1
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 1 of 48
, SECTION 1 | Bioenergetics and Thermodynamics | Q1-Q10 | BioChem 210 2026/2027
Q1 Question 1 of 50
Q1. A biochemistry student measures the Gibbs free energy change for a reaction
and finds Delta G = -45 kJ/mol at standard conditions. The student concludes this
reaction will proceed spontaneously under cellular conditions. Which
thermodynamic principle best supports this conclusion?
A. A negative Delta G indicates the reaction releases free energy and is exergonic,
favoring spontaneity.
B. A negative Delta G means the reaction requires an input of heat energy to proceed.
C. The reaction must have a positive enthalpy change to compensate for the negative free
energy.
D. A negative Delta G only applies at temperatures above 37 degrees Celsius.
Correct Answer: A
Rationale:
A negative Delta G indicates the reaction is exergonic, meaning it releases free energy and proceeds spontaneously
without external energy input. Choice B incorrectly describes endergonic reactions. Choice C is wrong because
negative Delta G can occur with either positive or negative enthalpy depending on entropy. Choice D is incorrect
because Delta G applies at any temperature where measured.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 2 of 48
,Q2 Question 2 of 50
Q2. During a laboratory experiment, a researcher observes that ATP hydrolysis to
ADP and inorganic phosphate releases approximately -30.5 kJ/mol under standard
conditions. The researcher wants to understand why this reaction is so favorable.
What structural feature of ATP primarily contributes to this large negative free
energy change?
A. The electrostatic repulsion between the three negatively charged phosphate groups
and the greater resonance stabilization of the products.
B. The presence of a high-energy carbon-carbon double bond within the adenine ring.
C. The covalent bond between the ribose sugar and the adenine base being easily broken.
D. The hydrogen bonding between the phosphate groups and surrounding water molecules.
Correct Answer: A
Rationale:
ATP's high phosphoryl transfer potential arises from electrostatic repulsion between adjacent negatively charged
phosphate groups and the greater resonance stabilization of ADP and Pi compared to ATP. Choice B is incorrect
because adenine lacks a high-energy double bond relevant to hydrolysis. Choice C describes a glycosidic bond
unrelated to ATP hydrolysis energy. Choice D describes hydration, not the thermodynamic driving force.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 3 of 48
, Q3 Question 3 of 50
Q3. In a cellular assay, a metabolic pathway is found to have a flux rate of 5.2
micromoles per minute. The investigator explains that flux represents the overall
throughput of metabolites. Which statement accurately describes metabolic flux in
the context of this pathway?
A. Flux is the rate of flow through a biochemical pathway, reflecting how quickly
substrates are converted to products under given conditions.
B. Flux is the total concentration of all enzymes present in the pathway at any given moment.
C. Flux represents the equilibrium constant of the rate-limiting step in the pathway.
D. Flux is defined as the sum of all individual reaction rates divided by the number of steps.
Correct Answer: A
Rationale:
Metabolic flux is correctly defined as the rate of metabolite flow through a pathway, measured in units like micromoles
per minute. Choice B confuses flux with enzyme concentration. Choice C incorrectly equates flux with an equilibrium
constant. Choice D presents a nonsensical calculation that does not correspond to any biochemical definition of flux.
BioChem 210 - 2026/2027 | Passing Score: 80% | Page 4 of 48
