BIOL 101 Quiz 3 V1 | BIOL 101 Principles of
Biology | Actual Q&A with Rationale (BIOL101 Quiz
3) | Liberty University
1. What is the primary role of ATP in cellular metabolism?
A. To serve as the primary structural component of the cell membrane.
B. To store genetic information for long-term inheritance.
C. To act as an immediate source of energy for various cellular processes.
D. To catalyze the breakdown of complex carbohydrates into glucose.
Correct Answer: C
Explanation: ATP, or adenosine triphosphate, is often referred to as the energy currency of
the cell. It provides the necessary energy for mechanical work, transport, and chemical
reactions through the hydrolysis of its phosphate bonds. Without ATP, most endergonic
reactions within the cell would not proceed.
2. During which stage of cellular respiration is the majority of ATP produced?
A. Glycolysis
B. Oxidative Phosphorylation
C. The Citric Acid Cycle
D. Pyruvate Oxidation
Correct Answer: B
,Explanation: Oxidative phosphorylation occurs in the inner mitochondrial membrane and
involves the electron transport chain and chemiosmosis. This stage generates
approximately 26 to 28 ATP molecules per glucose molecule. In contrast, glycolysis and the
citric acid cycle produce only a small amount of ATP through substrate-level
phosphorylation.
3. In photosynthesis, where do the light-dependent reactions take place?
A. The thylakoid membranes
B. The stroma of the chloroplast
C. The outer membrane of the chloroplast
D. The cytosol of the plant cell
Correct Answer: A
Explanation: The light-dependent reactions occur within the thylakoid membranes where
chlorophyll pigments are located. These reactions convert solar energy into chemical
energy in the form of ATP and NADPH. The stroma is the site for the light-independent
reactions, also known as the Calvin cycle.
4. What is the specific product of the Calvin Cycle that is used to form glucose?
A. Glyceraldehyde 3-phosphate (G3P)
B. Ribulose bisphosphate (RuBP)
C. Pyruvate
, D. Oxaloacetate
Correct Answer: A
Explanation: The Calvin cycle utilizes ATP and NADPH from the light reactions to fix
atmospheric CO2. The direct output of this cycle is a three-carbon sugar called G3P. Two
molecules of G3P can then be combined to form a single six-carbon glucose molecule.
5. During which phase of the cell cycle does DNA replication occur?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct Answer: B
Explanation: The S phase, or synthesis phase, is the portion of interphase where the cell’s
genome is duplicated. This ensures that when the cell divides during mitosis, each daughter
cell receives a complete and identical set of chromosomes. Replication is vital for
maintaining genetic consistency across cell generations.
6. Which process results in four non-identical haploid daughter cells?
A. Meiosis
B. Binary Fission
C. Mitosis
Biology | Actual Q&A with Rationale (BIOL101 Quiz
3) | Liberty University
1. What is the primary role of ATP in cellular metabolism?
A. To serve as the primary structural component of the cell membrane.
B. To store genetic information for long-term inheritance.
C. To act as an immediate source of energy for various cellular processes.
D. To catalyze the breakdown of complex carbohydrates into glucose.
Correct Answer: C
Explanation: ATP, or adenosine triphosphate, is often referred to as the energy currency of
the cell. It provides the necessary energy for mechanical work, transport, and chemical
reactions through the hydrolysis of its phosphate bonds. Without ATP, most endergonic
reactions within the cell would not proceed.
2. During which stage of cellular respiration is the majority of ATP produced?
A. Glycolysis
B. Oxidative Phosphorylation
C. The Citric Acid Cycle
D. Pyruvate Oxidation
Correct Answer: B
,Explanation: Oxidative phosphorylation occurs in the inner mitochondrial membrane and
involves the electron transport chain and chemiosmosis. This stage generates
approximately 26 to 28 ATP molecules per glucose molecule. In contrast, glycolysis and the
citric acid cycle produce only a small amount of ATP through substrate-level
phosphorylation.
3. In photosynthesis, where do the light-dependent reactions take place?
A. The thylakoid membranes
B. The stroma of the chloroplast
C. The outer membrane of the chloroplast
D. The cytosol of the plant cell
Correct Answer: A
Explanation: The light-dependent reactions occur within the thylakoid membranes where
chlorophyll pigments are located. These reactions convert solar energy into chemical
energy in the form of ATP and NADPH. The stroma is the site for the light-independent
reactions, also known as the Calvin cycle.
4. What is the specific product of the Calvin Cycle that is used to form glucose?
A. Glyceraldehyde 3-phosphate (G3P)
B. Ribulose bisphosphate (RuBP)
C. Pyruvate
, D. Oxaloacetate
Correct Answer: A
Explanation: The Calvin cycle utilizes ATP and NADPH from the light reactions to fix
atmospheric CO2. The direct output of this cycle is a three-carbon sugar called G3P. Two
molecules of G3P can then be combined to form a single six-carbon glucose molecule.
5. During which phase of the cell cycle does DNA replication occur?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Correct Answer: B
Explanation: The S phase, or synthesis phase, is the portion of interphase where the cell’s
genome is duplicated. This ensures that when the cell divides during mitosis, each daughter
cell receives a complete and identical set of chromosomes. Replication is vital for
maintaining genetic consistency across cell generations.
6. Which process results in four non-identical haploid daughter cells?
A. Meiosis
B. Binary Fission
C. Mitosis
