Biology for AP® Courses Practice Examination 2026 |
Comprehensive Biology Exam Review Covering All 38 Chapters
| AP Biology Practice Test Questions & Answers | Complete
AP Biology Study Guide | Latest Updated Practice Examination
| Cellular Biology, Genetics, Evolution, Ecology, Physiology &
Molecular Biology | Comprehensive Assessment & Exam
Preparation Resource
EXAM BLUEPRINT DISTRIBUTION
Topic Area
The Chemistry of Life
The Cell
Genetics
Molecular Biology
Evolution
Biological Diversity
Plant Structure and Function
Animal Structure and Function
Ecology
,Topic Area
Laboratory & Experimental Design
Question 1
A scientist isolates a molecule that contains carbon, hydrogen, oxygen,
nitrogen, and phosphorus. This molecule is most likely a:
A. Carbohydrate
B. Lipid
C. Nucleic acid
D. Protein
Correct Answer: C
Explanation: Nucleic acids (DNA and RNA) are the only
macromolecules that consistently contain phosphorus in their
phosphate backbone, along with carbon, hydrogen, oxygen, and
nitrogen.
Question 2
Which of the following best explains why water has a high specific heat
capacity?
A. Water molecules are small and move rapidly
B. Hydrogen bonds require significant energy to break
C. Water has a low molecular weight
D. Covalent bonds between oxygen and hydrogen are weak
Correct Answer: B
,Explanation: The extensive hydrogen bonding network in water
requires substantial energy input to increase molecular motion,
resulting in water's unusually high specific heat capacity.
Question 3
A solution has a pH of 3.0. If you add a base to this solution until the pH
reaches 7.0, the concentration of hydrogen ions has:
A. Increased by 4,000 times
B. Decreased by 10,000 times
C. Increased by 10,000 times
D. Decreased by 4 times
Correct Answer: B
Explanation: Each pH unit represents a tenfold change in hydrogen
ion concentration. Moving from pH 3 to pH 7 represents a 10⁴ or
10,000-fold decrease in [H⁺].
Question 4
During a dehydration synthesis reaction, two monosaccharides are
joined together. What molecule is released as a byproduct?
A. Carbon dioxide
B. Oxygen
C. Water
D. Hydrogen peroxide
Correct Answer: C
, Explanation: Dehydration synthesis (condensation reaction)
removes a hydroxyl group from one molecule and a hydrogen atom
from another, forming water as the byproduct.
Question 5
A researcher is studying a fatty acid with multiple double bonds in its
hydrocarbon chain. This fatty acid would be classified as:
A. Saturated
B. Monounsaturated
C. Polyunsaturated
D. Trans-saturated
Correct Answer: C
Explanation: Polyunsaturated fatty acids contain two or more
carbon-carbon double bonds, which create kinks in the hydrocarbon
chain and affect membrane fluidity.
Question 6
Which of the following functional groups is characterized by the
structure -COOH and acts as an acid?
A. Amino group
B. Carbonyl group
C. Hydroxyl group
D. Carboxyl group
Correct Answer: D
Comprehensive Biology Exam Review Covering All 38 Chapters
| AP Biology Practice Test Questions & Answers | Complete
AP Biology Study Guide | Latest Updated Practice Examination
| Cellular Biology, Genetics, Evolution, Ecology, Physiology &
Molecular Biology | Comprehensive Assessment & Exam
Preparation Resource
EXAM BLUEPRINT DISTRIBUTION
Topic Area
The Chemistry of Life
The Cell
Genetics
Molecular Biology
Evolution
Biological Diversity
Plant Structure and Function
Animal Structure and Function
Ecology
,Topic Area
Laboratory & Experimental Design
Question 1
A scientist isolates a molecule that contains carbon, hydrogen, oxygen,
nitrogen, and phosphorus. This molecule is most likely a:
A. Carbohydrate
B. Lipid
C. Nucleic acid
D. Protein
Correct Answer: C
Explanation: Nucleic acids (DNA and RNA) are the only
macromolecules that consistently contain phosphorus in their
phosphate backbone, along with carbon, hydrogen, oxygen, and
nitrogen.
Question 2
Which of the following best explains why water has a high specific heat
capacity?
A. Water molecules are small and move rapidly
B. Hydrogen bonds require significant energy to break
C. Water has a low molecular weight
D. Covalent bonds between oxygen and hydrogen are weak
Correct Answer: B
,Explanation: The extensive hydrogen bonding network in water
requires substantial energy input to increase molecular motion,
resulting in water's unusually high specific heat capacity.
Question 3
A solution has a pH of 3.0. If you add a base to this solution until the pH
reaches 7.0, the concentration of hydrogen ions has:
A. Increased by 4,000 times
B. Decreased by 10,000 times
C. Increased by 10,000 times
D. Decreased by 4 times
Correct Answer: B
Explanation: Each pH unit represents a tenfold change in hydrogen
ion concentration. Moving from pH 3 to pH 7 represents a 10⁴ or
10,000-fold decrease in [H⁺].
Question 4
During a dehydration synthesis reaction, two monosaccharides are
joined together. What molecule is released as a byproduct?
A. Carbon dioxide
B. Oxygen
C. Water
D. Hydrogen peroxide
Correct Answer: C
, Explanation: Dehydration synthesis (condensation reaction)
removes a hydroxyl group from one molecule and a hydrogen atom
from another, forming water as the byproduct.
Question 5
A researcher is studying a fatty acid with multiple double bonds in its
hydrocarbon chain. This fatty acid would be classified as:
A. Saturated
B. Monounsaturated
C. Polyunsaturated
D. Trans-saturated
Correct Answer: C
Explanation: Polyunsaturated fatty acids contain two or more
carbon-carbon double bonds, which create kinks in the hydrocarbon
chain and affect membrane fluidity.
Question 6
Which of the following functional groups is characterized by the
structure -COOH and acts as an acid?
A. Amino group
B. Carbonyl group
C. Hydroxyl group
D. Carboxyl group
Correct Answer: D
