Biochemistry Module 7 Exam Portage Learning Questions and Verified Answers, 100% Correctly
Answered & Rated A+ 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Biochemistry Module 7 Exam
Portage Learning Questions and
Verified Answers, 100% Correctly
Answered & Rated A+ 2026/2027
50 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Metabolism & Energy Production Protein & Amino Acid Metabolism
Carbohydrate Metabolism Metabolic Regulation & Integration
Lipid Metabolism
COVER PAGE - 1
, SECTION 1 | Metabolism & Energy Production | Q1-Q10 | Biochemistry Module 7 Exam Portage Learning Questions and Verified
Answers, 100% Correctly Answered & Rated A+ 2026/2027 2026/2027
Q1 Question 1 of 50
A research biochemist isolates a molecule from a cellular extract and finds that its hydrolysis releases
approximately -30.5 kJ/mol of free energy under standard conditions. Based on this energy yield, the
molecule is best classified as which type of compound?
A. A high-energy phosphate compound capable of driving endergonic reactions
B. A low-energy phosphate ester with no metabolic role
C. A structural polysaccharide used for cellular support
D. A peptide bond within a growing polypeptide chain
Correct Answer: A
Rationale:
Compounds releasing roughly -30 kJ/mol or more upon hydrolysis are high-energy phosphates, exemplified
by ATP, that can drive endergonic reactions through coupled reactions. Polysaccharides and peptide bonds
are structural or covalent bonds that do not serve this energy-coupling function.
Q2 Question 2 of 50
A 28-year-old marathon runner depletes her muscle glycogen late in a race and shifts to fatty acid
oxidation. In the catabolic pathway, the carbon atoms from fatty acids are ultimately released as which
molecule during the final common pathway of aerobic respiration?
A. Lactic acid accumulated in muscle tissue
B. Acetyl-CoA entering the citric acid cycle
C. Carbon dioxide produced in the citric acid cycle
D. Ethanol excreted through the lungs
Correct Answer: C
Rationale:
Carbon atoms from metabolic fuels are fully oxidized to carbon dioxide in the citric acid cycle, which is the
final common oxidative pathway. Acetyl-CoA is an intermediate feeding into the cycle, and lactic acid and
ethanol are products of anaerobic or fermentative routes, not the final aerobic product.
Biochemistry Module 7 Exam Portage Learning Questions and Verified Answers, 100% Correctly Answered & Rated A+ 2026/2027 - 2026/2027
Passing Score: 80% | Page 2 of 28
, SECTION 1 | Metabolism & Energy Production | Q1-Q10 | Biochemistry Module 7 Exam Portage Learning Questions and Verified
Answers, 100% Correctly Answered & Rated A+ 2026/2027 2026/2027
Q3 Question 3 of 50
An investigator measures the standard reduction potential of two electron carriers in a mitochondrial
preparation. Carrier X has E°' = -0.32 V and carrier Y has E°' = +0.04 V. When electrons flow from X
to Y, the change in reduction potential supports which conclusion?
A. Electrons move spontaneously from X to Y because the potential becomes more positive
B. The reaction is thermodynamically unfavorable because electrons move to a more negative
potential
C. The reaction requires ATP hydrolysis to proceed in either direction
D. No net electron transfer can occur between these two carriers
Correct Answer: A
Rationale:
Electron transfer is spontaneous when it moves from a carrier with a more negative reduction potential to
one with a more positive potential, releasing free energy. The increasing positive potential along the
electron transport chain drives proton pumping, and ATP is not required for this spontaneous flow.
Q4 Question 4 of 50
A medical student is studying oxidative phosphorylation and learns that the proton-motive force
across the inner mitochondrial membrane consists of two components. Which two gradients
collectively constitute the proton-motive force?
A. A sodium gradient and a potassium gradient across the membrane
B. A glucose gradient and a calcium gradient in the matrix
C. A pH gradient and an electrical potential across the membrane
D. An oxygen gradient and a carbon dioxide gradient in the intermembrane space
Correct Answer: C
Rationale:
The proton-motive force is the sum of the chemical pH gradient and the electrical membrane potential
generated by proton pumping into the intermembrane space. Sodium and potassium gradients are
characteristic of the plasma membrane, and glucose and oxygen gradients do not constitute this force.
Biochemistry Module 7 Exam Portage Learning Questions and Verified Answers, 100% Correctly Answered & Rated A+ 2026/2027 - 2026/2027
Passing Score: 80% | Page 3 of 28
Answered & Rated A+ 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Biochemistry Module 7 Exam
Portage Learning Questions and
Verified Answers, 100% Correctly
Answered & Rated A+ 2026/2027
50 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Metabolism & Energy Production Protein & Amino Acid Metabolism
Carbohydrate Metabolism Metabolic Regulation & Integration
Lipid Metabolism
COVER PAGE - 1
, SECTION 1 | Metabolism & Energy Production | Q1-Q10 | Biochemistry Module 7 Exam Portage Learning Questions and Verified
Answers, 100% Correctly Answered & Rated A+ 2026/2027 2026/2027
Q1 Question 1 of 50
A research biochemist isolates a molecule from a cellular extract and finds that its hydrolysis releases
approximately -30.5 kJ/mol of free energy under standard conditions. Based on this energy yield, the
molecule is best classified as which type of compound?
A. A high-energy phosphate compound capable of driving endergonic reactions
B. A low-energy phosphate ester with no metabolic role
C. A structural polysaccharide used for cellular support
D. A peptide bond within a growing polypeptide chain
Correct Answer: A
Rationale:
Compounds releasing roughly -30 kJ/mol or more upon hydrolysis are high-energy phosphates, exemplified
by ATP, that can drive endergonic reactions through coupled reactions. Polysaccharides and peptide bonds
are structural or covalent bonds that do not serve this energy-coupling function.
Q2 Question 2 of 50
A 28-year-old marathon runner depletes her muscle glycogen late in a race and shifts to fatty acid
oxidation. In the catabolic pathway, the carbon atoms from fatty acids are ultimately released as which
molecule during the final common pathway of aerobic respiration?
A. Lactic acid accumulated in muscle tissue
B. Acetyl-CoA entering the citric acid cycle
C. Carbon dioxide produced in the citric acid cycle
D. Ethanol excreted through the lungs
Correct Answer: C
Rationale:
Carbon atoms from metabolic fuels are fully oxidized to carbon dioxide in the citric acid cycle, which is the
final common oxidative pathway. Acetyl-CoA is an intermediate feeding into the cycle, and lactic acid and
ethanol are products of anaerobic or fermentative routes, not the final aerobic product.
Biochemistry Module 7 Exam Portage Learning Questions and Verified Answers, 100% Correctly Answered & Rated A+ 2026/2027 - 2026/2027
Passing Score: 80% | Page 2 of 28
, SECTION 1 | Metabolism & Energy Production | Q1-Q10 | Biochemistry Module 7 Exam Portage Learning Questions and Verified
Answers, 100% Correctly Answered & Rated A+ 2026/2027 2026/2027
Q3 Question 3 of 50
An investigator measures the standard reduction potential of two electron carriers in a mitochondrial
preparation. Carrier X has E°' = -0.32 V and carrier Y has E°' = +0.04 V. When electrons flow from X
to Y, the change in reduction potential supports which conclusion?
A. Electrons move spontaneously from X to Y because the potential becomes more positive
B. The reaction is thermodynamically unfavorable because electrons move to a more negative
potential
C. The reaction requires ATP hydrolysis to proceed in either direction
D. No net electron transfer can occur between these two carriers
Correct Answer: A
Rationale:
Electron transfer is spontaneous when it moves from a carrier with a more negative reduction potential to
one with a more positive potential, releasing free energy. The increasing positive potential along the
electron transport chain drives proton pumping, and ATP is not required for this spontaneous flow.
Q4 Question 4 of 50
A medical student is studying oxidative phosphorylation and learns that the proton-motive force
across the inner mitochondrial membrane consists of two components. Which two gradients
collectively constitute the proton-motive force?
A. A sodium gradient and a potassium gradient across the membrane
B. A glucose gradient and a calcium gradient in the matrix
C. A pH gradient and an electrical potential across the membrane
D. An oxygen gradient and a carbon dioxide gradient in the intermembrane space
Correct Answer: C
Rationale:
The proton-motive force is the sum of the chemical pH gradient and the electrical membrane potential
generated by proton pumping into the intermembrane space. Sodium and potassium gradients are
characteristic of the plasma membrane, and glucose and oxygen gradients do not constitute this force.
Biochemistry Module 7 Exam Portage Learning Questions and Verified Answers, 100% Correctly Answered & Rated A+ 2026/2027 - 2026/2027
Passing Score: 80% | Page 3 of 28
