CHEM 210 Biochemistry Module 1 to 8 Exams' &
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Module 1: Foundations of Biochemistry, Water, and pH
Q1. What is the definition of biochemistry?
A. The study of chemical reactions in non-living systems
B. The study of the structure and function of biomolecules
C. The study of physics in biological organisms
D. The study of mathematical models in biology
Correct Answer: B
Rationale: Biochemistry is often referred to as the "chemistry of life." It asks how
the remarkable properties of organisms relate to their molecules, focusing on the
relationship between structure and function of biomolecules.
Q2. What are the three primary areas that biochemists study in biological
organisms?
A. Cells, tissues, and organs
B. Structure, function, and biomolecules
C. Genes, proteins, and lipids
D. Metabolism, reproduction, and growth
Correct Answer: B
,Rationale: Biochemists study 1) the relationship between structure and function
of biomolecules, 2) chemical reactions of organisms (metabolism), and 3)
communication within and among organisms.
Q3. What property of water allows it to act as an effective solvent for ionic
compounds?
A. Low heat capacity
B. Nonpolarity
C. Polarity and hydrogen bonding
D. High viscosity
Correct Answer: C
Rationale: Water's polarity allows it to surround and stabilize ions via ion-dipole
interactions, facilitating dissolution.
Q4. What is known as the "medium of life"?
A. Carbon
B. Oxygen
C. Water
D. Nitrogen
Correct Answer: C
Rationale: Water is known as the "medium of life" because it makes up 70-90% of
living organisms and serves as the solvent for biochemical reactions.
Q5. True or False: Water can make up 85% (by mass) of a living organism.
Correct Answer: True
Rationale: Some plants are made up of 90% water by mass. Most living organisms
are composed of 70-90% water.
, Q6. Is Li (Lithium) an element common in biological organisms?
Correct Answer: No
Rationale: Lithium is not a common element in biological organisms. Common
biological elements include H, C, N, O, Na, P, S, Cl, K, and Ca.
Q7. What is the bond angle of a linear molecule?
A. 90 degrees
B. 109.5 degrees
C. 120 degrees
D. 180 degrees
Correct Answer: D
Rationale: Linear molecules, such as carbon dioxide (CO₂) and hydrogen cyanide
(HCN), have a bond angle of 180 degrees.
Q8. What is the bond angle of a tetrahedral molecule?
A. 90 degrees
B. 107.5 degrees
C. 109.5 degrees
D. 120 degrees
Correct Answer: C
Rationale: Tetrahedral molecules, such as methane (CH₄), have bond angles of
109.5 degrees.
Q9. What happens to pH when [H⁺] increases tenfold?
Final Exam () Portage Learning
Questions and Verified Answers, 100% Guaranteed
Pass ||Complete A+ Guide
Module 1: Foundations of Biochemistry, Water, and pH
Q1. What is the definition of biochemistry?
A. The study of chemical reactions in non-living systems
B. The study of the structure and function of biomolecules
C. The study of physics in biological organisms
D. The study of mathematical models in biology
Correct Answer: B
Rationale: Biochemistry is often referred to as the "chemistry of life." It asks how
the remarkable properties of organisms relate to their molecules, focusing on the
relationship between structure and function of biomolecules.
Q2. What are the three primary areas that biochemists study in biological
organisms?
A. Cells, tissues, and organs
B. Structure, function, and biomolecules
C. Genes, proteins, and lipids
D. Metabolism, reproduction, and growth
Correct Answer: B
,Rationale: Biochemists study 1) the relationship between structure and function
of biomolecules, 2) chemical reactions of organisms (metabolism), and 3)
communication within and among organisms.
Q3. What property of water allows it to act as an effective solvent for ionic
compounds?
A. Low heat capacity
B. Nonpolarity
C. Polarity and hydrogen bonding
D. High viscosity
Correct Answer: C
Rationale: Water's polarity allows it to surround and stabilize ions via ion-dipole
interactions, facilitating dissolution.
Q4. What is known as the "medium of life"?
A. Carbon
B. Oxygen
C. Water
D. Nitrogen
Correct Answer: C
Rationale: Water is known as the "medium of life" because it makes up 70-90% of
living organisms and serves as the solvent for biochemical reactions.
Q5. True or False: Water can make up 85% (by mass) of a living organism.
Correct Answer: True
Rationale: Some plants are made up of 90% water by mass. Most living organisms
are composed of 70-90% water.
, Q6. Is Li (Lithium) an element common in biological organisms?
Correct Answer: No
Rationale: Lithium is not a common element in biological organisms. Common
biological elements include H, C, N, O, Na, P, S, Cl, K, and Ca.
Q7. What is the bond angle of a linear molecule?
A. 90 degrees
B. 109.5 degrees
C. 120 degrees
D. 180 degrees
Correct Answer: D
Rationale: Linear molecules, such as carbon dioxide (CO₂) and hydrogen cyanide
(HCN), have a bond angle of 180 degrees.
Q8. What is the bond angle of a tetrahedral molecule?
A. 90 degrees
B. 107.5 degrees
C. 109.5 degrees
D. 120 degrees
Correct Answer: C
Rationale: Tetrahedral molecules, such as methane (CH₄), have bond angles of
109.5 degrees.
Q9. What happens to pH when [H⁺] increases tenfold?
