ACS Biophysical Chemistry Examination
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Biophysical chemistry primarily applies the principles of physics to the study
of
A. Rocks and minerals
B. Atmospheric gases
C. Industrial machinery
D. Biological molecules and systems
Correct Answer: D. Biological molecules and systems
Rationale: Biophysical chemistry uses physical principles to understand the
structure, properties, and behavior of biological molecules and processes.
2. Which biomolecule is responsible for storing genetic information?
A. Protein
B. Lipid
C. Carbohydrate
D. DNA
Correct Answer: D. DNA
Rationale: DNA stores hereditary information in the sequence of its nucleotides.
3. The monomers that make up proteins are
,A. Nucleotides
B. Fatty acids
C. Monosaccharides
D. Amino acids
Correct Answer: D. Amino acids
Rationale: Proteins are polymers composed of amino acid monomers linked by
peptide bonds.
4. Which level of protein structure describes the amino acid sequence?
A. Secondary
B. Tertiary
C. Quaternary
D. Primary
Correct Answer: D. Primary
Rationale: Primary structure is the linear sequence of amino acids in a protein.
5. An α-helix is an example of which level of protein structure?
A. Primary
B. Tertiary
C. Quaternary
D. Secondary
Correct Answer: D. Secondary
Rationale: α-Helices and β-sheets are common forms of secondary protein
structure.
6. Hydrogen bonds stabilize primarily which protein structure?
A. Primary
B. Secondary
,C. Genetic
D. Covalent
Correct Answer: B. Secondary
Rationale: Hydrogen bonds between backbone groups stabilize α-helices and β-
sheets.
7. The three-dimensional shape of a single polypeptide is its
A. Primary structure
B. Secondary structure
C. Quaternary structure
D. Tertiary structure
Correct Answer: D. Tertiary structure
Rationale: Tertiary structure describes the overall folding of one polypeptide chain.
8. Quaternary structure refers to
A. DNA replication
B. Lipid synthesis
C. RNA folding
D. Association of multiple polypeptide chains
Correct Answer: D. Association of multiple polypeptide chains
Rationale: Quaternary structure exists only in proteins containing more than one
polypeptide.
9. Hemoglobin is an example of a protein with
A. Primary structure only
B. Secondary structure only
C. Tertiary structure only
D. Quaternary structure
, Correct Answer: D. Quaternary structure
Rationale: Hemoglobin consists of four interacting polypeptide subunits.
10. The bond linking amino acids in proteins is the
A. Glycosidic bond
B. Ester bond
C. Hydrogen bond
D. Peptide bond
Correct Answer: D. Peptide bond
Rationale: Peptide bonds connect amino acids during protein synthesis.
11. Enzymes function primarily as
A. Structural carbohydrates
B. Lipid carriers
C. DNA molecules
D. Biological catalysts
Correct Answer: D. Biological catalysts
Rationale: Enzymes increase reaction rates without being consumed.
12. Enzymes increase reaction rates by lowering
A. Product concentration
B. Temperature
C. Enthalpy change
D. Activation energy
Correct Answer: D. Activation energy
Rationale: Lower activation energy allows more molecules to react successfully.
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Biophysical chemistry primarily applies the principles of physics to the study
of
A. Rocks and minerals
B. Atmospheric gases
C. Industrial machinery
D. Biological molecules and systems
Correct Answer: D. Biological molecules and systems
Rationale: Biophysical chemistry uses physical principles to understand the
structure, properties, and behavior of biological molecules and processes.
2. Which biomolecule is responsible for storing genetic information?
A. Protein
B. Lipid
C. Carbohydrate
D. DNA
Correct Answer: D. DNA
Rationale: DNA stores hereditary information in the sequence of its nucleotides.
3. The monomers that make up proteins are
,A. Nucleotides
B. Fatty acids
C. Monosaccharides
D. Amino acids
Correct Answer: D. Amino acids
Rationale: Proteins are polymers composed of amino acid monomers linked by
peptide bonds.
4. Which level of protein structure describes the amino acid sequence?
A. Secondary
B. Tertiary
C. Quaternary
D. Primary
Correct Answer: D. Primary
Rationale: Primary structure is the linear sequence of amino acids in a protein.
5. An α-helix is an example of which level of protein structure?
A. Primary
B. Tertiary
C. Quaternary
D. Secondary
Correct Answer: D. Secondary
Rationale: α-Helices and β-sheets are common forms of secondary protein
structure.
6. Hydrogen bonds stabilize primarily which protein structure?
A. Primary
B. Secondary
,C. Genetic
D. Covalent
Correct Answer: B. Secondary
Rationale: Hydrogen bonds between backbone groups stabilize α-helices and β-
sheets.
7. The three-dimensional shape of a single polypeptide is its
A. Primary structure
B. Secondary structure
C. Quaternary structure
D. Tertiary structure
Correct Answer: D. Tertiary structure
Rationale: Tertiary structure describes the overall folding of one polypeptide chain.
8. Quaternary structure refers to
A. DNA replication
B. Lipid synthesis
C. RNA folding
D. Association of multiple polypeptide chains
Correct Answer: D. Association of multiple polypeptide chains
Rationale: Quaternary structure exists only in proteins containing more than one
polypeptide.
9. Hemoglobin is an example of a protein with
A. Primary structure only
B. Secondary structure only
C. Tertiary structure only
D. Quaternary structure
, Correct Answer: D. Quaternary structure
Rationale: Hemoglobin consists of four interacting polypeptide subunits.
10. The bond linking amino acids in proteins is the
A. Glycosidic bond
B. Ester bond
C. Hydrogen bond
D. Peptide bond
Correct Answer: D. Peptide bond
Rationale: Peptide bonds connect amino acids during protein synthesis.
11. Enzymes function primarily as
A. Structural carbohydrates
B. Lipid carriers
C. DNA molecules
D. Biological catalysts
Correct Answer: D. Biological catalysts
Rationale: Enzymes increase reaction rates without being consumed.
12. Enzymes increase reaction rates by lowering
A. Product concentration
B. Temperature
C. Enthalpy change
D. Activation energy
Correct Answer: D. Activation energy
Rationale: Lower activation energy allows more molecules to react successfully.
