BIOCHEMISTRY CHEM 210 EXAM PREP
TEST BANK 150 Practice Questions with
Verified Answers & Detailed Rationales
Latest 2026/2027 Edition | Portage
Learning | A+ Graded
SECTION 1: FOUNDATIONS OF BIOCHEMISTRY (Questions
1-25)
Domain: Chemical Foundations & Biomolecular Principles
1. What is biochemistry?
• A. The study of inorganic compounds
• B. The chemistry of life
• C. The study of physical chemistry
• D. The study of nuclear chemistry
Rationale: Biochemistry is defined as the chemistry of life, focusing on the chemical
processes and substances that occur within living organisms .
2. What are the three main areas that biochemists study?
• A. Genetics, evolution, and ecology
• B. The relationship between structure and function of biomolecules,
chemical reactions of organisms (metabolism), and communication with and
among organisms
• C. Atomic structure, bonding, and thermodynamics
• D. Organic synthesis, inorganic reactions, and spectroscopy
,Rationale: Biochemists study the relationship between structure and function of
biomolecules, chemical reactions of organisms (metabolism), and communication within
and among organisms .
3. Which of the following is NOT a property of carbon that makes it the backbone
of organic molecules?
• A. It has 4 valence electrons
• B. It can form long chains
• C. It can form double and triple bonds
• D. It is the most abundant element in the universe
Rationale: Carbon has 4 valence electrons permitting it to form 4 bonds, forms long
chains and rings, and forms double and triple bonds. While carbon is abundant, its
abundance in the universe is not the reason it is the backbone of organic molecules .
4. How many of the 90 naturally occurring elements are found in living organisms?
• A. All 90
• B. About 50
• C. Less than 30
• D. Exactly 25
Rationale: Less than 30 of the 90 naturally occurring elements are found in living
organisms, primarily small nonmetals in the upper right of the periodic table .
5. Which element is critical to all living things and is found in large amounts?
• A. Carbon
• B. Helium
• C. Silicon
• D. Aluminum
Rationale: Carbon is critical to all living things and is found in large amounts. Its ability
to form four stable covalent bonds makes it the central building block for countless
complex organic molecules .
6. What is the difference between organic and inorganic chemistry?
• A. Organic studies salts, inorganic studies proteins
• B. Organic studies metals, inorganic studies nonmetals
• C. Organic is the study of carbon-based compounds, inorganic is the study
of compounds not typically containing carbon
, • D. Organic is physics-based, inorganic is biology-based
Rationale: Organic chemistry focuses on carbon-based compounds, while inorganic
chemistry studies compounds not typically containing carbon, such as metals, minerals,
and salts .
7. The bond angle associated with a linear molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Linear molecules (e.g., CO₂) have bond angles of 180° .
8. The bond angle associated with a tetrahedral molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Tetrahedral molecules (e.g., CH₄) have bond angles of approximately 109.5°.
This is the characteristic bond angle for sp³ hybridized carbon atoms .
9. The bond angle associated with a trigonal planar molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Trigonal planar molecules have bond angles of 120° (e.g., BF₃,
formaldehyde) .
10. The bond angle associated with a bent molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
, Rationale: Bent molecules (e.g., H₂O) have bond angles of approximately 104.5° due to
lone pair repulsion on the central atom .
11. Which of the following is the most efficient structure to draw for an organic
compound?
• A. Lewis structure
• B. Condensed formula
• C. Line-bond (skeletal) structure
• D. Structural formula
Rationale: The line-bond (skeletal) structure is the most efficient way to draw organic
compounds. Carbon atoms are implied at the ends and intersections of lines, and
hydrogen atoms attached to carbons are not shown .
12. In organic chemistry notation, what does the letter "R" typically represent?
• A. A reactive site on a molecule
• B. A ring structure
• C. An unspecified alkyl or hydrocarbon chain
• D. A radioactive isotope
Rationale: In organic chemistry, "R" represents an unspecified alkyl or hydrocarbon
chain. It is a general abbreviation used to indicate that any carbon chain could be
attached at that position .
13. What is the molecular shape and bond angle of carbon dioxide (CO₂)?
• A. Linear, 180°
• B. Bent, 109.5°
• C. Trigonal planar, 120°
• D. Tetrahedral, 109.5°
Rationale: Carbon dioxide has a linear molecular geometry with a bond angle of 180°.
The carbon atom is sp hybridized with two double bonds to oxygen atoms .
14. Which functional group is correctly identified as an amine?
• A. –OH
• B. –COOH
• C. –NH₂
• D. –CHO
TEST BANK 150 Practice Questions with
Verified Answers & Detailed Rationales
Latest 2026/2027 Edition | Portage
Learning | A+ Graded
SECTION 1: FOUNDATIONS OF BIOCHEMISTRY (Questions
1-25)
Domain: Chemical Foundations & Biomolecular Principles
1. What is biochemistry?
• A. The study of inorganic compounds
• B. The chemistry of life
• C. The study of physical chemistry
• D. The study of nuclear chemistry
Rationale: Biochemistry is defined as the chemistry of life, focusing on the chemical
processes and substances that occur within living organisms .
2. What are the three main areas that biochemists study?
• A. Genetics, evolution, and ecology
• B. The relationship between structure and function of biomolecules,
chemical reactions of organisms (metabolism), and communication with and
among organisms
• C. Atomic structure, bonding, and thermodynamics
• D. Organic synthesis, inorganic reactions, and spectroscopy
,Rationale: Biochemists study the relationship between structure and function of
biomolecules, chemical reactions of organisms (metabolism), and communication within
and among organisms .
3. Which of the following is NOT a property of carbon that makes it the backbone
of organic molecules?
• A. It has 4 valence electrons
• B. It can form long chains
• C. It can form double and triple bonds
• D. It is the most abundant element in the universe
Rationale: Carbon has 4 valence electrons permitting it to form 4 bonds, forms long
chains and rings, and forms double and triple bonds. While carbon is abundant, its
abundance in the universe is not the reason it is the backbone of organic molecules .
4. How many of the 90 naturally occurring elements are found in living organisms?
• A. All 90
• B. About 50
• C. Less than 30
• D. Exactly 25
Rationale: Less than 30 of the 90 naturally occurring elements are found in living
organisms, primarily small nonmetals in the upper right of the periodic table .
5. Which element is critical to all living things and is found in large amounts?
• A. Carbon
• B. Helium
• C. Silicon
• D. Aluminum
Rationale: Carbon is critical to all living things and is found in large amounts. Its ability
to form four stable covalent bonds makes it the central building block for countless
complex organic molecules .
6. What is the difference between organic and inorganic chemistry?
• A. Organic studies salts, inorganic studies proteins
• B. Organic studies metals, inorganic studies nonmetals
• C. Organic is the study of carbon-based compounds, inorganic is the study
of compounds not typically containing carbon
, • D. Organic is physics-based, inorganic is biology-based
Rationale: Organic chemistry focuses on carbon-based compounds, while inorganic
chemistry studies compounds not typically containing carbon, such as metals, minerals,
and salts .
7. The bond angle associated with a linear molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Linear molecules (e.g., CO₂) have bond angles of 180° .
8. The bond angle associated with a tetrahedral molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Tetrahedral molecules (e.g., CH₄) have bond angles of approximately 109.5°.
This is the characteristic bond angle for sp³ hybridized carbon atoms .
9. The bond angle associated with a trigonal planar molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
Rationale: Trigonal planar molecules have bond angles of 120° (e.g., BF₃,
formaldehyde) .
10. The bond angle associated with a bent molecular shape is:
• A. 180 degrees
• B. 120 degrees
• C. 109.5 degrees
• D. 104.5 degrees
, Rationale: Bent molecules (e.g., H₂O) have bond angles of approximately 104.5° due to
lone pair repulsion on the central atom .
11. Which of the following is the most efficient structure to draw for an organic
compound?
• A. Lewis structure
• B. Condensed formula
• C. Line-bond (skeletal) structure
• D. Structural formula
Rationale: The line-bond (skeletal) structure is the most efficient way to draw organic
compounds. Carbon atoms are implied at the ends and intersections of lines, and
hydrogen atoms attached to carbons are not shown .
12. In organic chemistry notation, what does the letter "R" typically represent?
• A. A reactive site on a molecule
• B. A ring structure
• C. An unspecified alkyl or hydrocarbon chain
• D. A radioactive isotope
Rationale: In organic chemistry, "R" represents an unspecified alkyl or hydrocarbon
chain. It is a general abbreviation used to indicate that any carbon chain could be
attached at that position .
13. What is the molecular shape and bond angle of carbon dioxide (CO₂)?
• A. Linear, 180°
• B. Bent, 109.5°
• C. Trigonal planar, 120°
• D. Tetrahedral, 109.5°
Rationale: Carbon dioxide has a linear molecular geometry with a bond angle of 180°.
The carbon atom is sp hybridized with two double bonds to oxygen atoms .
14. Which functional group is correctly identified as an amine?
• A. –OH
• B. –COOH
• C. –NH₂
• D. –CHO
