NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
BIO 101 Final Exam — NVCC
2 Latest Versions (Version A & B) | Actual Exam
200 Real Exam Questions and Correct Detailed Answers with Rationales | 2026/2027 Update
About This Exam: This comprehensive 200-question final examination for Northern Virginia Community College
(NVCC) BIO 101 — General Biology — is organized into two parallel versions (A and B), each containing 100
questions distributed across nine thematic sections. Each question includes four options (A–D) with the correct
answer clearly marked, followed by a detailed rationale explaining the biological principle, mechanism, or scientific
evidence supporting the answer and why the distractors are incorrect. Topics span the entire NVCC BIO 101 course
blueprint: scientific method, chemistry of life, macromolecules, cell structure and function, membrane transport,
metabolism, enzymes, cellular respiration, photosynthesis, cell division, genetics, molecular biology, evolution,
ecology, taxonomy, and conservation biology.
VERSION A — BIO 101 Final Exam Version A (100 Questions)
SECTION A1: Scientific Method, Chemistry of Life, and Macromolecules
Q1: A researcher hypothesizes that increasing temperature will increase the rate of photosynthesis in Elodea.
In this experiment, what is the independent variable?
A. The rate of photosynthesis measured as bubbles produced per minute
B. The temperature of the water bath [CORRECT]
C. The species of Elodea used
D. The amount of light exposure
Correct Answer: B
Rationale: The independent variable is the factor that the researcher deliberately manipulates. In this experiment, temperature
is the variable being changed across trials. Option A is the dependent variable (what is measured); options C and D should be
held constant as controlled variables to ensure a valid experimental design.
Q2: A student tests the effect of fertilizer concentration on plant growth. Which experimental design element
is ESSENTIAL to isolate the effect of fertilizer?
A. Using different plant species for each treatment group
B. Including a control group that receives no fertilizer [CORRECT]
C. Varying the light intensity across groups
D. Using a single plant per treatment group
Correct Answer: B
Rationale: A control group that receives no fertilizer establishes a baseline for comparison, allowing the researcher to attribute
any growth differences to the fertilizer alone. Option A introduces a confounding variable; option C also confounds results;
option D lacks statistical power due to small sample size. Proper experimental design requires controls, randomization, and
replication.
Q3: An atom of carbon has 6 protons, 6 neutrons, and 6 electrons. What is its atomic mass (rounded to the
nearest whole number)?
Northern Virginia Community College | Complete Solutions with Rationales Page 1
,NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
A. 6
B. 12 [CORRECT]
C. 18
D. 24
Correct Answer: B
Rationale: Atomic mass is the sum of protons and neutrons (electrons contribute negligible mass). For this carbon atom: 6
protons + 6 neutrons = 12 atomic mass units. This is the most common carbon isotope, carbon-12. Option A counts only
protons; option C adds electrons (incorrect); option D multiplies protons by neutrons.
Q4: Which type of chemical bond involves the COMPLETE TRANSFER of electrons from one atom to
another, resulting in the formation of charged ions?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond [CORRECT]
D. Van der Waals interaction
Correct Answer: C
Rationale: Ionic bonds form when one atom completely transfers electron(s) to another, creating a cation (positive ion) and
anion (negative ion) that are attracted to each other (e.g., NaCl). Covalent bonds involve sharing electrons (option A); hydrogen
bonds are weak attractions between partially charged atoms (option B); Van der Waals are transient weak forces (option D).
Q5: Water has a high specific heat capacity, meaning it absorbs a large amount of heat energy before its
temperature rises significantly. Which property of water BEST explains this phenomenon?
A. Water molecules are nonpolar
B. Hydrogen bonds between water molecules must be broken to raise the temperature [CORRECT]
C. Water is a small molecule
D. Water contains ionic bonds
Correct Answer: B
Rationale: Hydrogen bonds between adjacent water molecules absorb substantial energy before they break and allow
increased molecular motion (temperature rise). This property allows water to stabilize temperatures in cells, organisms, and
environments. Options A, C, and D are incorrect: water is polar, molecular size does not determine specific heat, and water
does not contain ionic bonds.
Q6: A solution has a hydrogen ion concentration [H+] of 1 × 10⁻³ M. What is the pH of this solution?
A. pH 3 (acidic) [CORRECT]
B. pH 7 (neutral)
C. pH 11 (basic)
D. pH 14 (strongly basic)
Correct Answer: A
Rationale: pH = -log[H+]. For [H+] = 1 × 10⁻³ M, pH = -log(10⁻³) = 3. Solutions with pH < 7 are acidic, pH 7 is neutral, and
pH > 7 is basic. A pH of 3 indicates a moderately strong acid. Options B, C, and D correspond to [H+] of 10⁻⁷, 10⁻¹¹, and
10⁻¹⁴ M respectively.
Q7: A buffer in the human bloodstream maintains a pH near 7.4. If a small amount of acid is added to the
blood, the buffer will:
Northern Virginia Community College | Complete Solutions with Rationales Page 2
,NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
A. Increase the pH dramatically
B. Resist pH change by absorbing excess H+ ions [CORRECT]
C. Convert all H+ ions to OH- ions
D. Release additional H+ ions into the blood
Correct Answer: B
Rationale: Buffers resist pH changes by absorbing or releasing H+ ions as needed. In blood, the carbonic acid-bicarbonate
buffer system absorbs excess H+ when acid is added, maintaining homeostasis. Option A is incorrect (buffers prevent dramatic
changes); option C is impossible chemically; option D would lower pH further, the opposite of a buffer's function.
Q8: Which biological macromolecule is correctly paired with its monomer subunit?
A. Protein — monosaccharide
B. Nucleic acid — amino acid
C. Carbohydrate — monosaccharide [CORRECT]
D. Lipid — nucleotide
Correct Answer: C
Rationale: Carbohydrates are polymers of monosaccharides (e.g., glucose, fructose) joined by glycosidic bonds. Proteins are
made of amino acids (option A is wrong); nucleic acids are made of nucleotides (option B is wrong); lipids are not true
polymers with repeating monomers (option D is wrong — they are diverse molecules including triglycerides, phospholipids, and
steroids).
Q9: A dehydration synthesis reaction between two glucose molecules results in the formation of maltose and
which byproduct?
A. Carbon dioxide
B. Water [CORRECT]
C. Oxygen
D. ATP
Correct Answer: B
Rationale: Dehydration synthesis (condensation) joins two monomers by removing a hydroxyl (-OH) from one and a hydrogen
(-H) from another, forming water as a byproduct. Two glucose molecules joined by a glycosidic bond form maltose plus H₂O.
Option A is a product of cellular respiration; option C is a product of photosynthesis; option D is an energy currency, not a
reaction byproduct.
Q10: Which statement correctly distinguishes saturated from unsaturated fatty acids?
A. Saturated fatty acids contain double bonds and are liquid at room temperature
B. Saturated fatty acids contain only single bonds and are solid at room temperature [CORRECT]
C. Unsaturated fatty acids contain only single bonds
D. Saturated fatty acids are typically found in plant oils
Correct Answer: B
Rationale: Saturated fatty acids have only single C-C bonds (no double bonds), allowing tight packing and making them solid
at room temperature (e.g., butter, animal fat). Unsaturated fatty acids contain one or more C=C double bonds causing kinks,
preventing tight packing and making them liquid at room temperature (e.g., olive oil). Options A and C reverse the definitions;
option D is incorrect — plant oils are typically unsaturated.
Q11: The primary structure of a protein refers to:
A. The three-dimensional folded shape of the protein
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, NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
B. The sequence of amino acids linked by peptide bonds [CORRECT]
C. The arrangement of multiple polypeptide subunits
D. The alpha-helix and beta-pleated sheet formations
Correct Answer: B
Rationale: Primary structure is the linear sequence of amino acids joined by peptide bonds, determined by the gene encoding
the protein. Secondary structure (alpha-helices, beta-sheets) forms through hydrogen bonding (option D); tertiary structure is
the 3D folded shape (option A); quaternary structure involves multiple polypeptide subunits (option C).
Q12: In a DNA nucleotide, the nitrogenous base is attached to which carbon of the deoxyribose sugar?
A. 1' carbon [CORRECT]
B. 2' carbon
C. 3' carbon
D. 5' carbon
Correct Answer: A
Rationale: In a nucleotide, the nitrogenous base (A, T, G, or C) is attached to the 1' carbon of the pentose sugar via an
N-glycosidic bond. The phosphate group is attached to the 5' carbon, and the 3' carbon has a hydroxyl group that forms the
phosphodiester bond with the next nucleotide. This numbering is essential for understanding DNA polarity (5' to 3').
SECTION A2: Cell Structure, Function, and Transport
Q13: According to the cell theory, which of the following statements is TRUE?
A. All cells arise spontaneously from non-living matter
B. All living organisms are composed of one or more cells, and all cells come from pre-existing cells [CORRECT]
C. Only eukaryotic cells are considered true cells
D. Cells can form from any organic material under the right conditions
Correct Answer: B
Rationale: Cell theory states: (1) all living things are made of cells, (2) the cell is the basic unit of life, and (3) all cells arise
from pre-existing cells (biogenesis). Option A describes spontaneous generation, disproven by Pasteur; option C is incorrect —
prokaryotic cells are true cells; option D is also spontaneous generation.
Q14: Which structural feature is UNIQUE to prokaryotic cells and NOT found in eukaryotic cells?
A. A plasma membrane
B. Ribosomes
C. A nucleoid region without a nuclear envelope [CORRECT]
D. DNA as the genetic material
Correct Answer: C
Rationale: Prokaryotes lack a true nucleus; their circular DNA is located in the nucleoid region (not membrane-bound). Both
prokaryotes and eukaryotes have plasma membranes (option A), ribosomes (option B, though size differs — 70S vs 80S), and
DNA as genetic material (option D). The presence of membrane-bound organelles is the defining feature distinguishing
eukaryotes from prokaryotes.
Q15: A cell is observed under a microscope and found to contain many mitochondria, extensive rough
endoplasmic reticulum, and a prominent Golgi apparatus. What is the MOST likely primary function of this
cell?
Northern Virginia Community College | Complete Solutions with Rationales Page 4
BIO 101 Final Exam — NVCC
2 Latest Versions (Version A & B) | Actual Exam
200 Real Exam Questions and Correct Detailed Answers with Rationales | 2026/2027 Update
About This Exam: This comprehensive 200-question final examination for Northern Virginia Community College
(NVCC) BIO 101 — General Biology — is organized into two parallel versions (A and B), each containing 100
questions distributed across nine thematic sections. Each question includes four options (A–D) with the correct
answer clearly marked, followed by a detailed rationale explaining the biological principle, mechanism, or scientific
evidence supporting the answer and why the distractors are incorrect. Topics span the entire NVCC BIO 101 course
blueprint: scientific method, chemistry of life, macromolecules, cell structure and function, membrane transport,
metabolism, enzymes, cellular respiration, photosynthesis, cell division, genetics, molecular biology, evolution,
ecology, taxonomy, and conservation biology.
VERSION A — BIO 101 Final Exam Version A (100 Questions)
SECTION A1: Scientific Method, Chemistry of Life, and Macromolecules
Q1: A researcher hypothesizes that increasing temperature will increase the rate of photosynthesis in Elodea.
In this experiment, what is the independent variable?
A. The rate of photosynthesis measured as bubbles produced per minute
B. The temperature of the water bath [CORRECT]
C. The species of Elodea used
D. The amount of light exposure
Correct Answer: B
Rationale: The independent variable is the factor that the researcher deliberately manipulates. In this experiment, temperature
is the variable being changed across trials. Option A is the dependent variable (what is measured); options C and D should be
held constant as controlled variables to ensure a valid experimental design.
Q2: A student tests the effect of fertilizer concentration on plant growth. Which experimental design element
is ESSENTIAL to isolate the effect of fertilizer?
A. Using different plant species for each treatment group
B. Including a control group that receives no fertilizer [CORRECT]
C. Varying the light intensity across groups
D. Using a single plant per treatment group
Correct Answer: B
Rationale: A control group that receives no fertilizer establishes a baseline for comparison, allowing the researcher to attribute
any growth differences to the fertilizer alone. Option A introduces a confounding variable; option C also confounds results;
option D lacks statistical power due to small sample size. Proper experimental design requires controls, randomization, and
replication.
Q3: An atom of carbon has 6 protons, 6 neutrons, and 6 electrons. What is its atomic mass (rounded to the
nearest whole number)?
Northern Virginia Community College | Complete Solutions with Rationales Page 1
,NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
A. 6
B. 12 [CORRECT]
C. 18
D. 24
Correct Answer: B
Rationale: Atomic mass is the sum of protons and neutrons (electrons contribute negligible mass). For this carbon atom: 6
protons + 6 neutrons = 12 atomic mass units. This is the most common carbon isotope, carbon-12. Option A counts only
protons; option C adds electrons (incorrect); option D multiplies protons by neutrons.
Q4: Which type of chemical bond involves the COMPLETE TRANSFER of electrons from one atom to
another, resulting in the formation of charged ions?
A. Covalent bond
B. Hydrogen bond
C. Ionic bond [CORRECT]
D. Van der Waals interaction
Correct Answer: C
Rationale: Ionic bonds form when one atom completely transfers electron(s) to another, creating a cation (positive ion) and
anion (negative ion) that are attracted to each other (e.g., NaCl). Covalent bonds involve sharing electrons (option A); hydrogen
bonds are weak attractions between partially charged atoms (option B); Van der Waals are transient weak forces (option D).
Q5: Water has a high specific heat capacity, meaning it absorbs a large amount of heat energy before its
temperature rises significantly. Which property of water BEST explains this phenomenon?
A. Water molecules are nonpolar
B. Hydrogen bonds between water molecules must be broken to raise the temperature [CORRECT]
C. Water is a small molecule
D. Water contains ionic bonds
Correct Answer: B
Rationale: Hydrogen bonds between adjacent water molecules absorb substantial energy before they break and allow
increased molecular motion (temperature rise). This property allows water to stabilize temperatures in cells, organisms, and
environments. Options A, C, and D are incorrect: water is polar, molecular size does not determine specific heat, and water
does not contain ionic bonds.
Q6: A solution has a hydrogen ion concentration [H+] of 1 × 10⁻³ M. What is the pH of this solution?
A. pH 3 (acidic) [CORRECT]
B. pH 7 (neutral)
C. pH 11 (basic)
D. pH 14 (strongly basic)
Correct Answer: A
Rationale: pH = -log[H+]. For [H+] = 1 × 10⁻³ M, pH = -log(10⁻³) = 3. Solutions with pH < 7 are acidic, pH 7 is neutral, and
pH > 7 is basic. A pH of 3 indicates a moderately strong acid. Options B, C, and D correspond to [H+] of 10⁻⁷, 10⁻¹¹, and
10⁻¹⁴ M respectively.
Q7: A buffer in the human bloodstream maintains a pH near 7.4. If a small amount of acid is added to the
blood, the buffer will:
Northern Virginia Community College | Complete Solutions with Rationales Page 2
,NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
A. Increase the pH dramatically
B. Resist pH change by absorbing excess H+ ions [CORRECT]
C. Convert all H+ ions to OH- ions
D. Release additional H+ ions into the blood
Correct Answer: B
Rationale: Buffers resist pH changes by absorbing or releasing H+ ions as needed. In blood, the carbonic acid-bicarbonate
buffer system absorbs excess H+ when acid is added, maintaining homeostasis. Option A is incorrect (buffers prevent dramatic
changes); option C is impossible chemically; option D would lower pH further, the opposite of a buffer's function.
Q8: Which biological macromolecule is correctly paired with its monomer subunit?
A. Protein — monosaccharide
B. Nucleic acid — amino acid
C. Carbohydrate — monosaccharide [CORRECT]
D. Lipid — nucleotide
Correct Answer: C
Rationale: Carbohydrates are polymers of monosaccharides (e.g., glucose, fructose) joined by glycosidic bonds. Proteins are
made of amino acids (option A is wrong); nucleic acids are made of nucleotides (option B is wrong); lipids are not true
polymers with repeating monomers (option D is wrong — they are diverse molecules including triglycerides, phospholipids, and
steroids).
Q9: A dehydration synthesis reaction between two glucose molecules results in the formation of maltose and
which byproduct?
A. Carbon dioxide
B. Water [CORRECT]
C. Oxygen
D. ATP
Correct Answer: B
Rationale: Dehydration synthesis (condensation) joins two monomers by removing a hydroxyl (-OH) from one and a hydrogen
(-H) from another, forming water as a byproduct. Two glucose molecules joined by a glycosidic bond form maltose plus H₂O.
Option A is a product of cellular respiration; option C is a product of photosynthesis; option D is an energy currency, not a
reaction byproduct.
Q10: Which statement correctly distinguishes saturated from unsaturated fatty acids?
A. Saturated fatty acids contain double bonds and are liquid at room temperature
B. Saturated fatty acids contain only single bonds and are solid at room temperature [CORRECT]
C. Unsaturated fatty acids contain only single bonds
D. Saturated fatty acids are typically found in plant oils
Correct Answer: B
Rationale: Saturated fatty acids have only single C-C bonds (no double bonds), allowing tight packing and making them solid
at room temperature (e.g., butter, animal fat). Unsaturated fatty acids contain one or more C=C double bonds causing kinks,
preventing tight packing and making them liquid at room temperature (e.g., olive oil). Options A and C reverse the definitions;
option D is incorrect — plant oils are typically unsaturated.
Q11: The primary structure of a protein refers to:
A. The three-dimensional folded shape of the protein
Northern Virginia Community College | Complete Solutions with Rationales Page 3
, NVCC BIO 101 | General Biology Final Examination 200 Questions | Version A & B | 2026/2027
B. The sequence of amino acids linked by peptide bonds [CORRECT]
C. The arrangement of multiple polypeptide subunits
D. The alpha-helix and beta-pleated sheet formations
Correct Answer: B
Rationale: Primary structure is the linear sequence of amino acids joined by peptide bonds, determined by the gene encoding
the protein. Secondary structure (alpha-helices, beta-sheets) forms through hydrogen bonding (option D); tertiary structure is
the 3D folded shape (option A); quaternary structure involves multiple polypeptide subunits (option C).
Q12: In a DNA nucleotide, the nitrogenous base is attached to which carbon of the deoxyribose sugar?
A. 1' carbon [CORRECT]
B. 2' carbon
C. 3' carbon
D. 5' carbon
Correct Answer: A
Rationale: In a nucleotide, the nitrogenous base (A, T, G, or C) is attached to the 1' carbon of the pentose sugar via an
N-glycosidic bond. The phosphate group is attached to the 5' carbon, and the 3' carbon has a hydroxyl group that forms the
phosphodiester bond with the next nucleotide. This numbering is essential for understanding DNA polarity (5' to 3').
SECTION A2: Cell Structure, Function, and Transport
Q13: According to the cell theory, which of the following statements is TRUE?
A. All cells arise spontaneously from non-living matter
B. All living organisms are composed of one or more cells, and all cells come from pre-existing cells [CORRECT]
C. Only eukaryotic cells are considered true cells
D. Cells can form from any organic material under the right conditions
Correct Answer: B
Rationale: Cell theory states: (1) all living things are made of cells, (2) the cell is the basic unit of life, and (3) all cells arise
from pre-existing cells (biogenesis). Option A describes spontaneous generation, disproven by Pasteur; option C is incorrect —
prokaryotic cells are true cells; option D is also spontaneous generation.
Q14: Which structural feature is UNIQUE to prokaryotic cells and NOT found in eukaryotic cells?
A. A plasma membrane
B. Ribosomes
C. A nucleoid region without a nuclear envelope [CORRECT]
D. DNA as the genetic material
Correct Answer: C
Rationale: Prokaryotes lack a true nucleus; their circular DNA is located in the nucleoid region (not membrane-bound). Both
prokaryotes and eukaryotes have plasma membranes (option A), ribosomes (option B, though size differs — 70S vs 80S), and
DNA as genetic material (option D). The presence of membrane-bound organelles is the defining feature distinguishing
eukaryotes from prokaryotes.
Q15: A cell is observed under a microscope and found to contain many mitochondria, extensive rough
endoplasmic reticulum, and a prominent Golgi apparatus. What is the MOST likely primary function of this
cell?
Northern Virginia Community College | Complete Solutions with Rationales Page 4
