CHEM 212 BIOCHEMISTRY W/ LAB | MODULE 1 PROBLEM
SET | 2026 NEW VERSION UPDATE | PORTAGE LEARNING |
ACTUAL QUESTIONS AND ANSWERS | WITH COMPLETE
SOLUTION
CHEM 212 – Biochemistry w/ Lab
Module 1 Problem Set (2026 Updated Version – Portage Learning)
Total Questions: 60
Question 1
What are three ways that biochemists study biological organisms?
A. Genetics, evolution, and ecology
B. Structure and function of biomolecules, metabolism, and cellular communication
C. Cell division, reproduction, and adaptation
D. Anatomy, physiology, and pathology
Correct Answer: B
Rationale:
Biochemistry focuses on understanding life at the molecular level. Biochemists study how the
structure of biomolecules determines their function, how chemical reactions drive metabolism, and
how cells communicate internally and with one another. These three approaches together explain
how biological systems operate. This framework connects molecular structure to biological behavior.
Question 2
What is the definition of biochemistry?
A. The study of living organisms and their environments
B. The chemistry of life and how molecular processes relate to organism function
C. The study of chemical reactions in nonliving systems
D. The branch of biology focused only on cells
Correct Answer: B
Rationale:
Biochemistry is often described as the chemistry of life because it examines how molecules give rise
to the properties of living organisms. It bridges chemistry and biology by explaining biological
,processes in chemical terms. This includes enzyme activity, molecular interactions, and energy
transformations. Understanding these relationships is essential to explaining life processes.
Question 3
What is another name for a firefly?
A. Glow beetle
B. Luminescent insect
C. Lightning bug
D. Spark moth
Correct Answer: C
Rationale:
The common name “lightning bug” is frequently used to describe fireflies, especially in North
America. Fireflies are known for their bioluminescence, which they use for communication and
mating. The term reflects their flashing light behavior. Both names refer to the same organism.
Question 4
Is lithium (Li) an element common in biological organisms?
A. Yes, it is essential for metabolism
B. Yes, it is a trace element
C. No, it is not commonly found in biological systems
D. No, because it is radioactive
Correct Answer: C
Rationale:
Lithium is not considered a common biological element. Living organisms primarily use elements
such as carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. While lithium has medical uses,
it does not play a standard biological role. Therefore, it is not classified as a common biological
element.
Question 5
What is known as the “medium of life”?
A. Air
B. Lipids
C. Proteins
D. Water
Correct Answer: D
Rationale:
Water is referred to as the “medium of life” because all known biological processes occur in aqueous
environments. Its polarity allows it to dissolve many substances, facilitating biochemical reactions.
, Water also stabilizes temperature and participates directly in metabolic reactions. Without water, life
as we know it could not exist.
Question 6
What is the bond angle associated with a trigonal pyramidal molecular shape?
A. 90°
B. 120°
C. 107.5°
D. 180°
Correct Answer: C
Rationale:
Trigonal pyramidal geometry occurs when a central atom has three bonded atoms and one lone pair.
The lone pair repels the bonded atoms more strongly, reducing the bond angle from the ideal
tetrahedral angle of 109.5°. This results in an approximate bond angle of 107.5°. Ammonia (NH₃) is a
classic example.
Question 7
Which element forms the backbone of all organic molecules?
A. Oxygen
B. Nitrogen
C. Carbon
D. Hydrogen
Correct Answer: C
Rationale:
Carbon is unique in its ability to form four stable covalent bonds. This allows it to create complex
chains and rings that serve as the foundation of biological molecules. Proteins, carbohydrates, lipids,
and nucleic acids all rely on carbon frameworks. This versatility makes carbon essential to life.
Question 8
Which bond is the strongest in biological molecules?
A. Hydrogen bond
B. Ionic bond
C. Van der Waals interaction
D. Covalent bond
Correct Answer: D
Rationale:
Covalent bonds involve the sharing of electrons and require significant energy to break. These bonds
SET | 2026 NEW VERSION UPDATE | PORTAGE LEARNING |
ACTUAL QUESTIONS AND ANSWERS | WITH COMPLETE
SOLUTION
CHEM 212 – Biochemistry w/ Lab
Module 1 Problem Set (2026 Updated Version – Portage Learning)
Total Questions: 60
Question 1
What are three ways that biochemists study biological organisms?
A. Genetics, evolution, and ecology
B. Structure and function of biomolecules, metabolism, and cellular communication
C. Cell division, reproduction, and adaptation
D. Anatomy, physiology, and pathology
Correct Answer: B
Rationale:
Biochemistry focuses on understanding life at the molecular level. Biochemists study how the
structure of biomolecules determines their function, how chemical reactions drive metabolism, and
how cells communicate internally and with one another. These three approaches together explain
how biological systems operate. This framework connects molecular structure to biological behavior.
Question 2
What is the definition of biochemistry?
A. The study of living organisms and their environments
B. The chemistry of life and how molecular processes relate to organism function
C. The study of chemical reactions in nonliving systems
D. The branch of biology focused only on cells
Correct Answer: B
Rationale:
Biochemistry is often described as the chemistry of life because it examines how molecules give rise
to the properties of living organisms. It bridges chemistry and biology by explaining biological
,processes in chemical terms. This includes enzyme activity, molecular interactions, and energy
transformations. Understanding these relationships is essential to explaining life processes.
Question 3
What is another name for a firefly?
A. Glow beetle
B. Luminescent insect
C. Lightning bug
D. Spark moth
Correct Answer: C
Rationale:
The common name “lightning bug” is frequently used to describe fireflies, especially in North
America. Fireflies are known for their bioluminescence, which they use for communication and
mating. The term reflects their flashing light behavior. Both names refer to the same organism.
Question 4
Is lithium (Li) an element common in biological organisms?
A. Yes, it is essential for metabolism
B. Yes, it is a trace element
C. No, it is not commonly found in biological systems
D. No, because it is radioactive
Correct Answer: C
Rationale:
Lithium is not considered a common biological element. Living organisms primarily use elements
such as carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. While lithium has medical uses,
it does not play a standard biological role. Therefore, it is not classified as a common biological
element.
Question 5
What is known as the “medium of life”?
A. Air
B. Lipids
C. Proteins
D. Water
Correct Answer: D
Rationale:
Water is referred to as the “medium of life” because all known biological processes occur in aqueous
environments. Its polarity allows it to dissolve many substances, facilitating biochemical reactions.
, Water also stabilizes temperature and participates directly in metabolic reactions. Without water, life
as we know it could not exist.
Question 6
What is the bond angle associated with a trigonal pyramidal molecular shape?
A. 90°
B. 120°
C. 107.5°
D. 180°
Correct Answer: C
Rationale:
Trigonal pyramidal geometry occurs when a central atom has three bonded atoms and one lone pair.
The lone pair repels the bonded atoms more strongly, reducing the bond angle from the ideal
tetrahedral angle of 109.5°. This results in an approximate bond angle of 107.5°. Ammonia (NH₃) is a
classic example.
Question 7
Which element forms the backbone of all organic molecules?
A. Oxygen
B. Nitrogen
C. Carbon
D. Hydrogen
Correct Answer: C
Rationale:
Carbon is unique in its ability to form four stable covalent bonds. This allows it to create complex
chains and rings that serve as the foundation of biological molecules. Proteins, carbohydrates, lipids,
and nucleic acids all rely on carbon frameworks. This versatility makes carbon essential to life.
Question 8
Which bond is the strongest in biological molecules?
A. Hydrogen bond
B. Ionic bond
C. Van der Waals interaction
D. Covalent bond
Correct Answer: D
Rationale:
Covalent bonds involve the sharing of electrons and require significant energy to break. These bonds
