LEHNINGER PRINCIPLES OF BIOCHEMISTRY
8TH EDITION TEST BANK PRACTICE QUESTIONS
Chapters 1–15 | Comprehensive Biochemistry Competency Assessment
Undergraduate Biochemistry / Molecular Biology Programs
75 Multiple-Choice & Scenario-Based Questions | Aligned with ASBMB Curriculum Guidelines
Passing Score: 75–80% (56–60/75 correct)
Testing Time: 120–150 Minutes
Format: Computer-Based, Proctored via Institutional LMS
Calculator Policy: Scientific calculator permitted for thermodynamic & kinetic calculations
, TABLE OF CONTENTS
Domain 1: Foundations of Biochemistry | Questions 1–5 | 5 Questions
Domain 2: Amino Acids & Protein Structure | Questions 6–10 | 5 Questions
Domain 3: Protein Function & Enzyme Kinetics | Questions 11–15 | 5 Questions
Domain 4: Carbohydrates & Glycobiology | Questions 16–20 | 5 Questions
Domain 5: Nucleotides & Nucleic Acids | Questions 21–25 | 5 Questions
Domain 6: Enzyme Mechanisms & Catalytic Strategies | Questions 26–30 | 5 Questions
Domain 7: Lipids & Biological Membranes | Questions 31–35 | 5 Questions
Domain 8: Signal Transduction & G-Protein Coupled Receptors | Questions 36–40 |
5 Questions
Domain 9: Metabolic Bioenergetics & Glycolysis | Questions 41–45 | 5 Questions
Domain 10: Gluconeogenesis & Glycogen Metabolism | Questions 46–50 | 5 Questions
Domain 11: Citric Acid Cycle & Oxidative Phosphorylation | Questions 51–55 | 5
Questions
Domain 12: Lipid Metabolism & Fatty Acid Oxidation | Questions 56–60 | 5 Questions
Domain 13: Amino Acid Metabolism & Nitrogen Disposal | Questions 61–65 | 5
Questions
Domain 14: DNA Replication, Repair & Recombination | Questions 66–70 | 5
Questions
Domain 15: Transcription & RNA Processing | Questions 71–75 | 5 Questions
Assessment Summary:
• 75 multiple-choice and scenario-based questions covering Lehninger Chapters 1-15
• Question Types: Single-best-answer, select-all-that-apply (SATA), calculation-based, pathway
analysis
• Focus: Evidence-based biochemical principles, metabolic pathway integration, analytical
judgment
• Aligned with Lehninger 8th Edition content, ASBMB curriculum standards, and program
learning outcomes
, LEHNINGER PRINCIPLES OF BIOCHEMISTRY
8TH EDITION TEST BANK — CHAPTERS 1–15
75 Questions | 120–150 Minutes | Passing Score: 75–80%
Question 1 [Foundations of Biochemistry]
A biochemical reaction has ΔH = +15 kJ/mol and ΔS = +50 J/(mol·K) at 298 K. What
is the value of ΔG, and is the reaction spontaneous under these conditions?
A) ΔG = +29.9 kJ/mol; not spontaneous
B) ΔG = +0.1 kJ/mol; not spontaneous
C) ΔG = −0.1 kJ/mol; spontaneous
D) ΔG = −29.9 kJ/mol; spontaneous
Rationale: Using ΔG = ΔH − TΔS, we convert ΔS to kJ: ΔS = +0.050 kJ/(mol·K). Then ΔG
= 15 kJ/mol − (298 K)(0.050 kJ/(mol·K)) = 15.0 − 14.9 = +0.1 kJ/mol. Since ΔG is slightly
positive, the reaction is not spontaneous under standard conditions. At slightly higher
temperatures, the TΔS term would dominate and the reaction would become spontaneous.
Question 2 [Foundations of Biochemistry]
You prepare a buffer by mixing 0.10 mol of acetic acid (pKa = 4.76) with 0.15 mol of
sodium acetate and diluting to 1.0 L. What is the pH of this buffer?
A) 4.28
B) 4.58
C) 4.94
D) 5.24
Rationale: Using the Henderson-Hasselbalch equation, pH = pKa + log([A⁻]/[HA]) = 4.76
+ log(0.15/0.10) = 4.76 + log(1.5) = 4.76 + 0.18 = 4.94. The buffer pH is slightly above the
pKa because the conjugate base concentration exceeds the acid concentration.
Question 3 [Foundations of Biochemistry]
The conversion of glucose-6-phosphate to glucose-Pi has ΔG°' = +13.8 kJ/mol. This
reaction can be driven forward in glycolysis by coupling it with the hydrolysis of
glucose-6-phosphate (ΔG°' = −13.8 kJ/mol). When two reactions are coupled, what
is true about the overall ΔG°' of the coupled process?
A) It equals the product of the individual ΔG°' values
B) It equals the sum of the individual ΔG°' values
C) It equals the difference between the larger and smaller ΔG°' values
D) It is always equal to zero because the reactions cancel
Rationale: When reactions are coupled, the overall standard free energy change is the
sum of the individual ΔG°' values, because ΔG is a state function. This principle allows
thermodynamically unfavorable reactions to proceed when coupled to sufficiently
favorable ones, as long as the sum of the ΔG°' values is negative.
Question 4 [Foundations of Biochemistry]
Which of the following statements best describes the role of hydrogen bonding in
the unique properties of water as a biochemical solvent?
A) Hydrogen bonds in water are stronger than covalent bonds and give water its high
dielectric constant
B) Hydrogen bonds are transient, cooperative interactions that give water a
high heat of vaporization and high surface tension, making it an excellent
solvent for polar and ionic solutes
8TH EDITION TEST BANK PRACTICE QUESTIONS
Chapters 1–15 | Comprehensive Biochemistry Competency Assessment
Undergraduate Biochemistry / Molecular Biology Programs
75 Multiple-Choice & Scenario-Based Questions | Aligned with ASBMB Curriculum Guidelines
Passing Score: 75–80% (56–60/75 correct)
Testing Time: 120–150 Minutes
Format: Computer-Based, Proctored via Institutional LMS
Calculator Policy: Scientific calculator permitted for thermodynamic & kinetic calculations
, TABLE OF CONTENTS
Domain 1: Foundations of Biochemistry | Questions 1–5 | 5 Questions
Domain 2: Amino Acids & Protein Structure | Questions 6–10 | 5 Questions
Domain 3: Protein Function & Enzyme Kinetics | Questions 11–15 | 5 Questions
Domain 4: Carbohydrates & Glycobiology | Questions 16–20 | 5 Questions
Domain 5: Nucleotides & Nucleic Acids | Questions 21–25 | 5 Questions
Domain 6: Enzyme Mechanisms & Catalytic Strategies | Questions 26–30 | 5 Questions
Domain 7: Lipids & Biological Membranes | Questions 31–35 | 5 Questions
Domain 8: Signal Transduction & G-Protein Coupled Receptors | Questions 36–40 |
5 Questions
Domain 9: Metabolic Bioenergetics & Glycolysis | Questions 41–45 | 5 Questions
Domain 10: Gluconeogenesis & Glycogen Metabolism | Questions 46–50 | 5 Questions
Domain 11: Citric Acid Cycle & Oxidative Phosphorylation | Questions 51–55 | 5
Questions
Domain 12: Lipid Metabolism & Fatty Acid Oxidation | Questions 56–60 | 5 Questions
Domain 13: Amino Acid Metabolism & Nitrogen Disposal | Questions 61–65 | 5
Questions
Domain 14: DNA Replication, Repair & Recombination | Questions 66–70 | 5
Questions
Domain 15: Transcription & RNA Processing | Questions 71–75 | 5 Questions
Assessment Summary:
• 75 multiple-choice and scenario-based questions covering Lehninger Chapters 1-15
• Question Types: Single-best-answer, select-all-that-apply (SATA), calculation-based, pathway
analysis
• Focus: Evidence-based biochemical principles, metabolic pathway integration, analytical
judgment
• Aligned with Lehninger 8th Edition content, ASBMB curriculum standards, and program
learning outcomes
, LEHNINGER PRINCIPLES OF BIOCHEMISTRY
8TH EDITION TEST BANK — CHAPTERS 1–15
75 Questions | 120–150 Minutes | Passing Score: 75–80%
Question 1 [Foundations of Biochemistry]
A biochemical reaction has ΔH = +15 kJ/mol and ΔS = +50 J/(mol·K) at 298 K. What
is the value of ΔG, and is the reaction spontaneous under these conditions?
A) ΔG = +29.9 kJ/mol; not spontaneous
B) ΔG = +0.1 kJ/mol; not spontaneous
C) ΔG = −0.1 kJ/mol; spontaneous
D) ΔG = −29.9 kJ/mol; spontaneous
Rationale: Using ΔG = ΔH − TΔS, we convert ΔS to kJ: ΔS = +0.050 kJ/(mol·K). Then ΔG
= 15 kJ/mol − (298 K)(0.050 kJ/(mol·K)) = 15.0 − 14.9 = +0.1 kJ/mol. Since ΔG is slightly
positive, the reaction is not spontaneous under standard conditions. At slightly higher
temperatures, the TΔS term would dominate and the reaction would become spontaneous.
Question 2 [Foundations of Biochemistry]
You prepare a buffer by mixing 0.10 mol of acetic acid (pKa = 4.76) with 0.15 mol of
sodium acetate and diluting to 1.0 L. What is the pH of this buffer?
A) 4.28
B) 4.58
C) 4.94
D) 5.24
Rationale: Using the Henderson-Hasselbalch equation, pH = pKa + log([A⁻]/[HA]) = 4.76
+ log(0.15/0.10) = 4.76 + log(1.5) = 4.76 + 0.18 = 4.94. The buffer pH is slightly above the
pKa because the conjugate base concentration exceeds the acid concentration.
Question 3 [Foundations of Biochemistry]
The conversion of glucose-6-phosphate to glucose-Pi has ΔG°' = +13.8 kJ/mol. This
reaction can be driven forward in glycolysis by coupling it with the hydrolysis of
glucose-6-phosphate (ΔG°' = −13.8 kJ/mol). When two reactions are coupled, what
is true about the overall ΔG°' of the coupled process?
A) It equals the product of the individual ΔG°' values
B) It equals the sum of the individual ΔG°' values
C) It equals the difference between the larger and smaller ΔG°' values
D) It is always equal to zero because the reactions cancel
Rationale: When reactions are coupled, the overall standard free energy change is the
sum of the individual ΔG°' values, because ΔG is a state function. This principle allows
thermodynamically unfavorable reactions to proceed when coupled to sufficiently
favorable ones, as long as the sum of the ΔG°' values is negative.
Question 4 [Foundations of Biochemistry]
Which of the following statements best describes the role of hydrogen bonding in
the unique properties of water as a biochemical solvent?
A) Hydrogen bonds in water are stronger than covalent bonds and give water its high
dielectric constant
B) Hydrogen bonds are transient, cooperative interactions that give water a
high heat of vaporization and high surface tension, making it an excellent
solvent for polar and ionic solutes
