CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
CHEM 210 BIOCHEM MODULE 4 EXAM
(2026/2027)
Questions and Verified Answers | Portage
Learning
Portage Learning – Biochemistry Module 4 (Lipids) • Verified Answers • 100% Guarantee Pass
Total Questions 100 (Sequential Q1–Q100)
Number of Sections 8
Question Format Multiple Choice (4 options, ONE correct)
Question Style 70% Application/Scenario • 30% Direct Recall
Cognitive Level Mix 30% Recall • 50% Application • 20% Analysis
Answer Key Format Correct option tagged [CORRECT] • Answer line • 2–4 sentence rationale
Lipid Fundamentals • Fatty Acids • TAGs • Phospholipids • Steroids •
Coverage
Lipoproteins • Eicosanoids • Metabolism/Clinical
# Section Title Range
Lipid Fundamentals and Classification (Lipid Definition, Solubility, Biological Roles, &
1 Q1-Q14
Classification Systems)
Fatty Acid Structure and Nomenclature (Saturated, Unsaturated, Omega Numbering, Chain
2 Q15-Q30
Length, & Physical Properties)
3 Triacylglycerols and Energy Storage (Structure, Function, Adipose Tissue, & Energy Density) Q31-Q42
Phospholipids and Membrane Lipids (Glycerophospholipids, Sphingolipids, & Membrane
4 Q43-Q56
Assembly)
5 Steroids and Cholesterol (Cholesterol Structure, Steroid Hormones, Bile Acids, & Vitamin D) Q57-Q70
Lipoproteins and Lipid Transport (Chylomicrons, VLDL, LDL, HDL, & Apolipoprotein
6 Q71-Q82
Functions)
Eicosanoids and Lipid Signaling (Prostaglandins, Thromboxanes, Leukotrienes, & Arachidonic
7 Q83-Q90
Acid)
Lipid Metabolism Overview and Clinical Correlations (Beta-Oxidation Overview, Ketone
8 Q91-Q100
Bodies, Hyperlipidemias, & Atherosclerosis)
All answers verified for accuracy against standard biochemistry textbooks (Berg, Tymoczko & Stryer; Lehninger; Garrett
& Grisham). Each rationale includes structural principles, transport mechanisms, metabolic logic, clinical significance, and
Page 1
,CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
study strategy notes.
Page 2
,CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
SECTION 1
Section 1: Lipid Fundamentals and Classification (Lipid Definition, Solubility,
Biological Roles, & Classification Systems)
Questions Q1-Q14
Q1: A biochemistry student is asked to define a lipid based on a physical property rather than a single
chemical structure. Which definition is MOST accurate for the Portage Learning CHEM 210 Module
4 framework?
A. Lipids are a heterogeneous group of biological compounds that are insoluble in water but soluble in
nonpolar organic solvents such as ether, chloroform, and benzene. [CORRECT]
B. Lipids are polymers of amino acids linked by peptide bonds that are insoluble in water.
C. Lipids are carbohydrates composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio.
D. Lipids are nucleotide polymers that store genetic information.
Correct Answer: A
Rationale: Lipids are defined operationally by their solubility: insoluble in water (hydrophobic) but soluble in
nonpolar organic solvents. They have no single structural backbone (unlike proteins, carbohydrates, nucleic acids).
Verified correct: this solubility-based definition is the foundation of lipid classification in standard biochemistry
textbooks and Portage Learning Module 4.
Q2: A graduate student examines a phospholipid molecule and notes it contains both a hydrophilic
phosphate head group and hydrophobic fatty acid tails. Which term BEST describes this dual nature?
A. Amphipathic, meaning the molecule has both hydrophilic (polar) and hydrophobic (nonpolar) regions
within the same molecule. [CORRECT]
B. Hydrophilic only, since it dissolves in water.
C. Hydrophobic only, since it has long carbon chains.
D. Amphoteric, meaning it can act as either an acid or a base.
Correct Answer: A
Rationale: Amphipathic molecules contain both hydrophilic and hydrophobic regions in the same molecule,
which is essential for membrane bilayer formation. Amphoteric refers to acid-base behavior. Verified correct:
phospholipids, bile salts, and cholesterol are all amphipathic, enabling membrane and emulsification functions.
Page 3
, CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
Q3: Which biological function is NOT typically attributed to lipids in human biochemistry?
A. Catalysis of glycolytic enzymes as cofactors in the cytoplasm. [CORRECT]
B. Energy storage in the form of triacylglycerols.
C. Structural components of cell membranes as phospholipids and cholesterol.
D. Signaling molecules such as steroid hormones and prostaglandins.
Correct Answer: A
Rationale: Lipids function in energy storage (TAG), membrane structure (phospholipids, cholesterol), signaling
(steroids, prostaglandins), insulation, and vitamin transport. They do NOT serve as cofactors catalyzing glycolysis
(that role belongs to vitamins/minerals). Verified correct: glycolysis is catalyzed by protein enzymes with non-lipid
cofactors.
Q4: According to the classical Bloor classification system, which of the following is an example of a
SIMPLE lipid (containing only carbon, hydrogen, and oxygen with no additional elements)?
A. Triacylglycerol (glycerol + 3 fatty acids), a simple lipid composed of C, H, and O only. [CORRECT]
B. Phospholipid, which contains phosphorus and nitrogen in addition to C, H, and O.
C. Glycolipid, which contains a carbohydrate moiety.
D. Sphingomyelin, which contains both phosphorus and nitrogen.
Correct Answer: A
Rationale: Under Bloor's classification: simple lipids (TAGs, waxes) contain only C, H, O; compound lipids
(phospholipids, glycolipids) contain additional P, N, or S; derived lipids (steroids, fatty acids) are hydrolysis
products. Verified correct: TAGs are simple lipids because they contain only C, H, and O.
Q5: A biochemistry lab classifies lipids based on saponification (ability to form soap when treated
with alkali). Which of the following would be classified as a NON-SAPONIFIABLE lipid?
A. Cholesterol, a steroid that lacks an ester bond and cannot be hydrolyzed by alkali to form soap.
[CORRECT]
B. Triacylglycerol, which yields glycerol and fatty acid salts (soap) upon alkaline hydrolysis.
C. Phospholipid, which can be saponified at its ester linkages.
D. Wax, which contains ester bonds that can be saponified.
Correct Answer: A
Rationale: Saponifiable lipids contain ester linkages that hydrolyze in alkali to form soap (TAGs, phospholipids,
waxes). Non-saponifiable lipids lack ester bonds and include steroids, terpenes, prostaglandins, and fat-soluble
vitamins. Verified correct: cholesterol has no ester bond in its core structure, so it is non-saponifiable.
Page 4
CHEM 210 BIOCHEM MODULE 4 EXAM
(2026/2027)
Questions and Verified Answers | Portage
Learning
Portage Learning – Biochemistry Module 4 (Lipids) • Verified Answers • 100% Guarantee Pass
Total Questions 100 (Sequential Q1–Q100)
Number of Sections 8
Question Format Multiple Choice (4 options, ONE correct)
Question Style 70% Application/Scenario • 30% Direct Recall
Cognitive Level Mix 30% Recall • 50% Application • 20% Analysis
Answer Key Format Correct option tagged [CORRECT] • Answer line • 2–4 sentence rationale
Lipid Fundamentals • Fatty Acids • TAGs • Phospholipids • Steroids •
Coverage
Lipoproteins • Eicosanoids • Metabolism/Clinical
# Section Title Range
Lipid Fundamentals and Classification (Lipid Definition, Solubility, Biological Roles, &
1 Q1-Q14
Classification Systems)
Fatty Acid Structure and Nomenclature (Saturated, Unsaturated, Omega Numbering, Chain
2 Q15-Q30
Length, & Physical Properties)
3 Triacylglycerols and Energy Storage (Structure, Function, Adipose Tissue, & Energy Density) Q31-Q42
Phospholipids and Membrane Lipids (Glycerophospholipids, Sphingolipids, & Membrane
4 Q43-Q56
Assembly)
5 Steroids and Cholesterol (Cholesterol Structure, Steroid Hormones, Bile Acids, & Vitamin D) Q57-Q70
Lipoproteins and Lipid Transport (Chylomicrons, VLDL, LDL, HDL, & Apolipoprotein
6 Q71-Q82
Functions)
Eicosanoids and Lipid Signaling (Prostaglandins, Thromboxanes, Leukotrienes, & Arachidonic
7 Q83-Q90
Acid)
Lipid Metabolism Overview and Clinical Correlations (Beta-Oxidation Overview, Ketone
8 Q91-Q100
Bodies, Hyperlipidemias, & Atherosclerosis)
All answers verified for accuracy against standard biochemistry textbooks (Berg, Tymoczko & Stryer; Lehninger; Garrett
& Grisham). Each rationale includes structural principles, transport mechanisms, metabolic logic, clinical significance, and
Page 1
,CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
study strategy notes.
Page 2
,CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
SECTION 1
Section 1: Lipid Fundamentals and Classification (Lipid Definition, Solubility,
Biological Roles, & Classification Systems)
Questions Q1-Q14
Q1: A biochemistry student is asked to define a lipid based on a physical property rather than a single
chemical structure. Which definition is MOST accurate for the Portage Learning CHEM 210 Module
4 framework?
A. Lipids are a heterogeneous group of biological compounds that are insoluble in water but soluble in
nonpolar organic solvents such as ether, chloroform, and benzene. [CORRECT]
B. Lipids are polymers of amino acids linked by peptide bonds that are insoluble in water.
C. Lipids are carbohydrates composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio.
D. Lipids are nucleotide polymers that store genetic information.
Correct Answer: A
Rationale: Lipids are defined operationally by their solubility: insoluble in water (hydrophobic) but soluble in
nonpolar organic solvents. They have no single structural backbone (unlike proteins, carbohydrates, nucleic acids).
Verified correct: this solubility-based definition is the foundation of lipid classification in standard biochemistry
textbooks and Portage Learning Module 4.
Q2: A graduate student examines a phospholipid molecule and notes it contains both a hydrophilic
phosphate head group and hydrophobic fatty acid tails. Which term BEST describes this dual nature?
A. Amphipathic, meaning the molecule has both hydrophilic (polar) and hydrophobic (nonpolar) regions
within the same molecule. [CORRECT]
B. Hydrophilic only, since it dissolves in water.
C. Hydrophobic only, since it has long carbon chains.
D. Amphoteric, meaning it can act as either an acid or a base.
Correct Answer: A
Rationale: Amphipathic molecules contain both hydrophilic and hydrophobic regions in the same molecule,
which is essential for membrane bilayer formation. Amphoteric refers to acid-base behavior. Verified correct:
phospholipids, bile salts, and cholesterol are all amphipathic, enabling membrane and emulsification functions.
Page 3
, CHEM 210 – Biochemistry (Module 4: Lipids) Portage Learning | 2026/2027
Q3: Which biological function is NOT typically attributed to lipids in human biochemistry?
A. Catalysis of glycolytic enzymes as cofactors in the cytoplasm. [CORRECT]
B. Energy storage in the form of triacylglycerols.
C. Structural components of cell membranes as phospholipids and cholesterol.
D. Signaling molecules such as steroid hormones and prostaglandins.
Correct Answer: A
Rationale: Lipids function in energy storage (TAG), membrane structure (phospholipids, cholesterol), signaling
(steroids, prostaglandins), insulation, and vitamin transport. They do NOT serve as cofactors catalyzing glycolysis
(that role belongs to vitamins/minerals). Verified correct: glycolysis is catalyzed by protein enzymes with non-lipid
cofactors.
Q4: According to the classical Bloor classification system, which of the following is an example of a
SIMPLE lipid (containing only carbon, hydrogen, and oxygen with no additional elements)?
A. Triacylglycerol (glycerol + 3 fatty acids), a simple lipid composed of C, H, and O only. [CORRECT]
B. Phospholipid, which contains phosphorus and nitrogen in addition to C, H, and O.
C. Glycolipid, which contains a carbohydrate moiety.
D. Sphingomyelin, which contains both phosphorus and nitrogen.
Correct Answer: A
Rationale: Under Bloor's classification: simple lipids (TAGs, waxes) contain only C, H, O; compound lipids
(phospholipids, glycolipids) contain additional P, N, or S; derived lipids (steroids, fatty acids) are hydrolysis
products. Verified correct: TAGs are simple lipids because they contain only C, H, and O.
Q5: A biochemistry lab classifies lipids based on saponification (ability to form soap when treated
with alkali). Which of the following would be classified as a NON-SAPONIFIABLE lipid?
A. Cholesterol, a steroid that lacks an ester bond and cannot be hydrolyzed by alkali to form soap.
[CORRECT]
B. Triacylglycerol, which yields glycerol and fatty acid salts (soap) upon alkaline hydrolysis.
C. Phospholipid, which can be saponified at its ester linkages.
D. Wax, which contains ester bonds that can be saponified.
Correct Answer: A
Rationale: Saponifiable lipids contain ester linkages that hydrolyze in alkali to form soap (TAGs, phospholipids,
waxes). Non-saponifiable lipids lack ester bonds and include steroids, terpenes, prostaglandins, and fat-soluble
vitamins. Verified correct: cholesterol has no ester bond in its core structure, so it is non-saponifiable.
Page 4
