BIOL 1408 Actual Exam 2 | Biology for Non-Science Majors I |
2026/2027 Complete Practice Questions, Correct Answers &
Detailed Rationales
Section I: Cellular Energy & Metabolism
1. What is the primary function of ATP in cells?
A. Store hereditary information
B. Provide immediately usable cellular energy
C. Form the cell membrane
D. Transport oxygen in blood
Correct Answer: B. Provide immediately usable cellular energy
Rationale: ATP is the cell's major short-term energy-transfer molecule.
2. Which molecule is commonly broken down to provide energy for
cellular activities?
A. Glucose
B. DNA
C. Cholesterol
D. Cellulose
Correct Answer: A. Glucose
Rationale: Glucose contains chemical energy that cells can extract
through cellular respiration.
3. Metabolism refers to:
A. Only the digestion of food
B. All chemical reactions occurring in an organism
,C. Only reactions occurring in the nucleus
D. Movement of molecules across membranes
Correct Answer: B. All chemical reactions occurring in an organism
Rationale: Metabolism includes the complete collection of anabolic and
catabolic reactions.
4. A catabolic reaction generally:
A. Builds larger molecules
B. Breaks molecules down and releases energy
C. Produces DNA exclusively
D. Requires no enzymes
Correct Answer: B. Breaks molecules down and releases energy
Rationale: Catabolism involves degradation of molecules, often
releasing usable energy.
5. An anabolic reaction generally:
A. Builds larger molecules from smaller ones
B. Breaks glucose into carbon dioxide
C. Destroys ATP
D. Releases all stored energy as heat
Correct Answer: A. Builds larger molecules from smaller ones
Rationale: Anabolism requires energy to construct complex molecules.
6. Which molecule is phosphorylated to form ATP?
A. ADP
B. DNA
C. NAD⁺
D. Glucose
,Correct Answer: A. ADP
Rationale: ATP forms when a phosphate group is added to ADP.
7. ATP consists of:
A. Adenine, ribose, and three phosphate groups
B. Glucose and three phosphates
C. Adenine and deoxyribose only
D. Glycerol and fatty acids
Correct Answer: A. Adenine, ribose, and three phosphate groups
Rationale: ATP is a nucleotide composed of adenine, ribose, and three
phosphates.
8. The energy released from ATP hydrolysis is primarily used to:
A. Power cellular work
B. Create sunlight
C. Destroy all enzymes
D. Prevent diffusion
Correct Answer: A. Power cellular work
Rationale: ATP hydrolysis provides energy for processes such as
transport, movement, and synthesis.
9. Enzymes are primarily:
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
, Correct Answer: B. Proteins
Rationale: Most biological enzymes are proteins that function as
catalysts.
10. The main function of an enzyme is to:
A. Increase activation energy
B. Lower activation energy
C. Stop chemical reactions
D. Increase product energy permanently
Correct Answer: B. Lower activation energy
Rationale: Enzymes accelerate reactions by lowering the activation-
energy barrier.
11. The region of an enzyme where a substrate binds is the:
A. Nucleus
B. Active site
C. Phospholipid tail
D. Codon
Correct Answer: B. Active site
Rationale: The active site has chemical properties that allow the
substrate to bind and react.
12. A substrate is:
A. A molecule acted upon by an enzyme
B. A product of DNA replication
C. A membrane lipid
D. A chromosome
2026/2027 Complete Practice Questions, Correct Answers &
Detailed Rationales
Section I: Cellular Energy & Metabolism
1. What is the primary function of ATP in cells?
A. Store hereditary information
B. Provide immediately usable cellular energy
C. Form the cell membrane
D. Transport oxygen in blood
Correct Answer: B. Provide immediately usable cellular energy
Rationale: ATP is the cell's major short-term energy-transfer molecule.
2. Which molecule is commonly broken down to provide energy for
cellular activities?
A. Glucose
B. DNA
C. Cholesterol
D. Cellulose
Correct Answer: A. Glucose
Rationale: Glucose contains chemical energy that cells can extract
through cellular respiration.
3. Metabolism refers to:
A. Only the digestion of food
B. All chemical reactions occurring in an organism
,C. Only reactions occurring in the nucleus
D. Movement of molecules across membranes
Correct Answer: B. All chemical reactions occurring in an organism
Rationale: Metabolism includes the complete collection of anabolic and
catabolic reactions.
4. A catabolic reaction generally:
A. Builds larger molecules
B. Breaks molecules down and releases energy
C. Produces DNA exclusively
D. Requires no enzymes
Correct Answer: B. Breaks molecules down and releases energy
Rationale: Catabolism involves degradation of molecules, often
releasing usable energy.
5. An anabolic reaction generally:
A. Builds larger molecules from smaller ones
B. Breaks glucose into carbon dioxide
C. Destroys ATP
D. Releases all stored energy as heat
Correct Answer: A. Builds larger molecules from smaller ones
Rationale: Anabolism requires energy to construct complex molecules.
6. Which molecule is phosphorylated to form ATP?
A. ADP
B. DNA
C. NAD⁺
D. Glucose
,Correct Answer: A. ADP
Rationale: ATP forms when a phosphate group is added to ADP.
7. ATP consists of:
A. Adenine, ribose, and three phosphate groups
B. Glucose and three phosphates
C. Adenine and deoxyribose only
D. Glycerol and fatty acids
Correct Answer: A. Adenine, ribose, and three phosphate groups
Rationale: ATP is a nucleotide composed of adenine, ribose, and three
phosphates.
8. The energy released from ATP hydrolysis is primarily used to:
A. Power cellular work
B. Create sunlight
C. Destroy all enzymes
D. Prevent diffusion
Correct Answer: A. Power cellular work
Rationale: ATP hydrolysis provides energy for processes such as
transport, movement, and synthesis.
9. Enzymes are primarily:
A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids
, Correct Answer: B. Proteins
Rationale: Most biological enzymes are proteins that function as
catalysts.
10. The main function of an enzyme is to:
A. Increase activation energy
B. Lower activation energy
C. Stop chemical reactions
D. Increase product energy permanently
Correct Answer: B. Lower activation energy
Rationale: Enzymes accelerate reactions by lowering the activation-
energy barrier.
11. The region of an enzyme where a substrate binds is the:
A. Nucleus
B. Active site
C. Phospholipid tail
D. Codon
Correct Answer: B. Active site
Rationale: The active site has chemical properties that allow the
substrate to bind and react.
12. A substrate is:
A. A molecule acted upon by an enzyme
B. A product of DNA replication
C. A membrane lipid
D. A chromosome
