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BIOLOGY FOR AP® COURSES 2026 QUESTIONS WITH VERIFIED ANSWERS DETAILED
RATIONALES GRADED A+
Biology for AP® Courses
Section 1: Biochemistry & Macromolecules (Questions 1-25)
1. Which property of water allows it to moderate temperature in living
organisms?
A. Low specific heat
B. High specific heat
C. Low heat of vaporization
D. Nonpolar nature
Rationale: Water's high specific heat allows it to absorb and release large
amounts of heat with minimal temperature change, moderating temperatures in
organisms and environments.
2. The cohesion of water molecules is primarily due to which type of bond?
A. Ionic bonds
B. Covalent bonds
C. Hydrogen bonds
D. Van der Waals forces
Rationale: Hydrogen bonds between water molecules create cohesion, allowing
water to resist separation and creating surface tension.
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3. Which of the following is a monosaccharide?
A. Sucrose
B. Lactose
C. Glucose
D. Maltose
Rationale: Glucose is a monosaccharide (simple sugar). Sucrose, lactose, and
maltose are disaccharides composed of two monosaccharides.
4. What type of bond links amino acids together in a protein?
A. Glycosidic bond
B. Ester bond
C. Peptide bond
D. Phosphodiester bond
Rationale: Peptide bonds form between the carboxyl group of one amino acid and
the amino group of another through dehydration synthesis.
5. Which level of protein structure is determined by the sequence of amino
acids?
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
Rationale: Primary structure is the linear sequence of amino acids, determined by
the genetic code.
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6. A saturated fatty acid differs from an unsaturated fatty acid because a
saturated fatty acid:
A. Contains double bonds between carbons
B. Contains only single bonds between carbons
C. Is liquid at room temperature
D. Has fewer hydrogen atoms
Rationale: Saturated fatty acids have only single bonds between carbon atoms
and are saturated with hydrogen, making them solid at room temperature.
7. Which macromolecule is composed of nucleotides?
A. Proteins
B. Carbohydrates
C. Lipids
D. Nucleic acids
Rationale: Nucleic acids (DNA and RNA) are polymers of nucleotides, each
consisting of a phosphate group, a pentose sugar, and a nitrogenous base.
8. The secondary structure of a protein is characterized by:
A. The linear sequence of amino acids
B. Alpha helices and beta-pleated sheets
C. The overall three-dimensional shape
D. The interaction of multiple polypeptide chains
Rationale: Secondary structure refers to local folding patterns, primarily alpha
helices and beta-pleated sheets, stabilized by hydrogen bonds.
9. Which of the following is a function of lipids?
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A. Catalyzing chemical reactions
B. Storing genetic information
C. Long-term energy storage
D. Providing structural support in hair and nails
Rationale: Lipids, particularly triglycerides, serve as long-term energy storage
molecules.
10. The formation of a glycosidic bond involves:
A. Hydrolysis of a water molecule
B. Dehydration synthesis
C. Addition of a phosphate group
D. Reduction of a carbonyl group
Rationale: Glycosidic bonds form between monosaccharides through dehydration
synthesis (removal of water).
11. Which functional group is characteristic of alcohols?
A. Carboxyl group (-COOH)
B. Hydroxyl group (-OH)
C. Amino group (-NH₂)
D. Sulfhydryl group (-SH)
Rationale: The hydroxyl group (-OH) is characteristic of alcohols and is polar,
contributing to the solubility of alcohols in water.
12. A buffer is a substance that:
A. Increases the pH of a solution
B. Decreases the pH of a solution
C. Resists changes in pH
D. Neutralizes all acids and bases
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BIOLOGY FOR AP® COURSES 2026 QUESTIONS WITH VERIFIED ANSWERS DETAILED
RATIONALES GRADED A+
Biology for AP® Courses
Section 1: Biochemistry & Macromolecules (Questions 1-25)
1. Which property of water allows it to moderate temperature in living
organisms?
A. Low specific heat
B. High specific heat
C. Low heat of vaporization
D. Nonpolar nature
Rationale: Water's high specific heat allows it to absorb and release large
amounts of heat with minimal temperature change, moderating temperatures in
organisms and environments.
2. The cohesion of water molecules is primarily due to which type of bond?
A. Ionic bonds
B. Covalent bonds
C. Hydrogen bonds
D. Van der Waals forces
Rationale: Hydrogen bonds between water molecules create cohesion, allowing
water to resist separation and creating surface tension.
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,Page 2 of 74
3. Which of the following is a monosaccharide?
A. Sucrose
B. Lactose
C. Glucose
D. Maltose
Rationale: Glucose is a monosaccharide (simple sugar). Sucrose, lactose, and
maltose are disaccharides composed of two monosaccharides.
4. What type of bond links amino acids together in a protein?
A. Glycosidic bond
B. Ester bond
C. Peptide bond
D. Phosphodiester bond
Rationale: Peptide bonds form between the carboxyl group of one amino acid and
the amino group of another through dehydration synthesis.
5. Which level of protein structure is determined by the sequence of amino
acids?
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Quaternary structure
Rationale: Primary structure is the linear sequence of amino acids, determined by
the genetic code.
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6. A saturated fatty acid differs from an unsaturated fatty acid because a
saturated fatty acid:
A. Contains double bonds between carbons
B. Contains only single bonds between carbons
C. Is liquid at room temperature
D. Has fewer hydrogen atoms
Rationale: Saturated fatty acids have only single bonds between carbon atoms
and are saturated with hydrogen, making them solid at room temperature.
7. Which macromolecule is composed of nucleotides?
A. Proteins
B. Carbohydrates
C. Lipids
D. Nucleic acids
Rationale: Nucleic acids (DNA and RNA) are polymers of nucleotides, each
consisting of a phosphate group, a pentose sugar, and a nitrogenous base.
8. The secondary structure of a protein is characterized by:
A. The linear sequence of amino acids
B. Alpha helices and beta-pleated sheets
C. The overall three-dimensional shape
D. The interaction of multiple polypeptide chains
Rationale: Secondary structure refers to local folding patterns, primarily alpha
helices and beta-pleated sheets, stabilized by hydrogen bonds.
9. Which of the following is a function of lipids?
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A. Catalyzing chemical reactions
B. Storing genetic information
C. Long-term energy storage
D. Providing structural support in hair and nails
Rationale: Lipids, particularly triglycerides, serve as long-term energy storage
molecules.
10. The formation of a glycosidic bond involves:
A. Hydrolysis of a water molecule
B. Dehydration synthesis
C. Addition of a phosphate group
D. Reduction of a carbonyl group
Rationale: Glycosidic bonds form between monosaccharides through dehydration
synthesis (removal of water).
11. Which functional group is characteristic of alcohols?
A. Carboxyl group (-COOH)
B. Hydroxyl group (-OH)
C. Amino group (-NH₂)
D. Sulfhydryl group (-SH)
Rationale: The hydroxyl group (-OH) is characteristic of alcohols and is polar,
contributing to the solubility of alcohols in water.
12. A buffer is a substance that:
A. Increases the pH of a solution
B. Decreases the pH of a solution
C. Resists changes in pH
D. Neutralizes all acids and bases
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