THE MOLECULAR BASIS OF LIFE & CELL
BIOLOGY QUESTIONS | VERIFIED
ANSWERS & RATIONALES UPDATED FOR
2026
(Chapters 1–10)
1. Cell theory is one of the foundations of biology. What are the core tenets of the cell theory? (Select
all that apply)
A) All organisms are made up of more than one cell.
B) Cells carry genetic material passed to daughter cells during cellular division.
C) Cells arise from other cells through the process of cell division.
D) All living organisms consist of cells.
Correct Answers: B, C, D
Rationale: Cell theory states that all living things are composed of cells (D), cells are the basic
unit of life, all cells come from pre-existing cells (C), and cells contain hereditary information
(DNA) which is passed to new cells (B). Some organisms (like bacteria) are unicellular, making A
incorrect .
2. Which of the following best describes the concept of "emergent properties"?
A) The reduction of a complex system to its individual components.
B) The ability of an organism to maintain a stable internal environment.
C) New properties that arise from interactions within a system that are not present in the individual
parts.
D) The process by which species change over time.
Correct Answer: C
, Rationale: Emergent properties are characteristics that appear at higher levels of biological
organization (e.g., consciousness from neurons) that are not present in the lower-level
components (e.g., individual nerve cells) .
3. A localized group of organisms that belong to the same species is called a:
A) Biosystem
B) Community
C) Population
D) Ecosystem
Correct Answer: C
Rationale: A population is defined as a group of individuals of the same species living in the
same area. A community includes multiple species .
4. To understand the chemical basis of inheritance, we must understand the molecular structure of
DNA. This is an example of the application of which concept?
A) Evolution
B) Reductionism
C) Systems Biology
D) Feedback regulation
Correct Answer: B
Rationale: Reductionism is the approach of reducing complex systems to simpler components to
understand them. Understanding DNA structure is a reductionist approach to understanding
heredity .
5. Once labor begins in childbirth, contractions increase in intensity and frequency until delivery. This
is an example of:
A) Negative feedback
B) Positive feedback
C) Homeostasis
D) Metabolism
Correct Answer: B
Rationale: Positive feedback amplifies a process, moving the system away from its starting
state. In labor, the initial contractions stimulate the release of oxytocin, which causes stronger
contractions until delivery .
6. Which of the following types of cells utilize DNA as their genetic material but do NOT have their
DNA encased within a nuclear envelope?
A) Animal
, B) Plant
C) Fungi
D) Archaea
Correct Answer: D
Rationale: Archaea (and Bacteria) are prokaryotes, meaning they lack a membrane-bound
nucleus. Their DNA is located in the nucleoid region .
7. What is the primary function of the cuticle in land plants?
A) Photosynthesis
B) Water and nutrient transport
C) Preventing water loss
D) Gas exchange
Correct Answer: C
Rationale: The waxy cuticle is an adaptation to terrestrial life that prevents desiccation (drying
out) .
8. What is the smallest unit of life that can exist as a separate entity?
A) A molecule
B) A cell
C) A tissue
D) An organ
Correct Answer: B
Rationale: The cell is the basic structural and functional unit of life. Molecules are not alive;
tissues and organs are collections of cells .
9. Which of the following statements about isotopes is NOT true?
A) All isotopes of an element have the same number of electrons.
B) All isotopes of an element have the same number of protons.
C) All isotopes of an element have the same number of neutrons.
D) Isotopes are identified by their mass number.
Correct Answer: C
Rationale: Isotopes are variants of a chemical element that have the same number of protons
but a different number of neutrons. Therefore, they do not have the same number of neutrons .
10. Which organelle is responsible for converting solar energy to chemical energy in plants?
A) Mitochondria
BIOLOGY QUESTIONS | VERIFIED
ANSWERS & RATIONALES UPDATED FOR
2026
(Chapters 1–10)
1. Cell theory is one of the foundations of biology. What are the core tenets of the cell theory? (Select
all that apply)
A) All organisms are made up of more than one cell.
B) Cells carry genetic material passed to daughter cells during cellular division.
C) Cells arise from other cells through the process of cell division.
D) All living organisms consist of cells.
Correct Answers: B, C, D
Rationale: Cell theory states that all living things are composed of cells (D), cells are the basic
unit of life, all cells come from pre-existing cells (C), and cells contain hereditary information
(DNA) which is passed to new cells (B). Some organisms (like bacteria) are unicellular, making A
incorrect .
2. Which of the following best describes the concept of "emergent properties"?
A) The reduction of a complex system to its individual components.
B) The ability of an organism to maintain a stable internal environment.
C) New properties that arise from interactions within a system that are not present in the individual
parts.
D) The process by which species change over time.
Correct Answer: C
, Rationale: Emergent properties are characteristics that appear at higher levels of biological
organization (e.g., consciousness from neurons) that are not present in the lower-level
components (e.g., individual nerve cells) .
3. A localized group of organisms that belong to the same species is called a:
A) Biosystem
B) Community
C) Population
D) Ecosystem
Correct Answer: C
Rationale: A population is defined as a group of individuals of the same species living in the
same area. A community includes multiple species .
4. To understand the chemical basis of inheritance, we must understand the molecular structure of
DNA. This is an example of the application of which concept?
A) Evolution
B) Reductionism
C) Systems Biology
D) Feedback regulation
Correct Answer: B
Rationale: Reductionism is the approach of reducing complex systems to simpler components to
understand them. Understanding DNA structure is a reductionist approach to understanding
heredity .
5. Once labor begins in childbirth, contractions increase in intensity and frequency until delivery. This
is an example of:
A) Negative feedback
B) Positive feedback
C) Homeostasis
D) Metabolism
Correct Answer: B
Rationale: Positive feedback amplifies a process, moving the system away from its starting
state. In labor, the initial contractions stimulate the release of oxytocin, which causes stronger
contractions until delivery .
6. Which of the following types of cells utilize DNA as their genetic material but do NOT have their
DNA encased within a nuclear envelope?
A) Animal
, B) Plant
C) Fungi
D) Archaea
Correct Answer: D
Rationale: Archaea (and Bacteria) are prokaryotes, meaning they lack a membrane-bound
nucleus. Their DNA is located in the nucleoid region .
7. What is the primary function of the cuticle in land plants?
A) Photosynthesis
B) Water and nutrient transport
C) Preventing water loss
D) Gas exchange
Correct Answer: C
Rationale: The waxy cuticle is an adaptation to terrestrial life that prevents desiccation (drying
out) .
8. What is the smallest unit of life that can exist as a separate entity?
A) A molecule
B) A cell
C) A tissue
D) An organ
Correct Answer: B
Rationale: The cell is the basic structural and functional unit of life. Molecules are not alive;
tissues and organs are collections of cells .
9. Which of the following statements about isotopes is NOT true?
A) All isotopes of an element have the same number of electrons.
B) All isotopes of an element have the same number of protons.
C) All isotopes of an element have the same number of neutrons.
D) Isotopes are identified by their mass number.
Correct Answer: C
Rationale: Isotopes are variants of a chemical element that have the same number of protons
but a different number of neutrons. Therefore, they do not have the same number of neutrons .
10. Which organelle is responsible for converting solar energy to chemical energy in plants?
A) Mitochondria
