CELL BIOLOGY 112 EXAM 1 PCC (2025/2026)
Pasadena City College | Foundational Cell
Biology Assessment Questions with Complete
Answers & Detailed Rationales
Q1. The cell theory states that all living organisms are composed of:
• A) Cells
• B) Tissues
• C) Organs
• D) Molecules
Rationale: The cell theory establishes that cells are the fundamental structural and
functional units of all living organisms. Cells are the smallest units that can carry
out all life processes. Tissues and organs are composed of cells, and molecules are
the chemical building blocks within cells.
Why Wrong: B, C, D represent higher levels of biological organization or
chemical components, not the fundamental unit of life.
Q2. Which of the following is NOT a component of the modern cell theory?
• A) All living organisms are composed of one or more cells
• B) The cell is the basic unit of life
• C) Cells arise from non-living matter spontaneously
• D) All cells arise from pre-existing cells
Rationale: The modern cell theory includes three principles: 1) All living
organisms are composed of cells, 2) The cell is the basic unit of life, and 3) All
cells arise from pre-existing cells. Spontaneous generation (cells arising from non-
living matter) was disproven by Pasteur and others.
Why Wrong: A, B, D are all components of modern cell theory.
,Q3. Who was the first scientist to observe and describe cells?
• A) Antonie van Leeuwenhoek
• B) Robert Hooke
• C) Matthias Schleiden
• D) Theodor Schwann
Rationale: Robert Hooke first observed and described cells in 1665 using a
compound microscope to examine a thin slice of cork, coining the term "cell." Van
Leeuwenhoek observed living microorganisms; Schleiden and Schwann
contributed to cell theory later.
Why Wrong: A observed microorganisms, C/D contributed to cell theory later.
Q4. Which scientist is credited with first observing living microorganisms?
• A) Robert Hooke
• B) Antonie van Leeuwenhoek
• C) Rudolf Virchow
• D) Louis Pasteur
Rationale: Antonie van Leeuwenhoek was the first to observe living
microorganisms ("animalcules") using a simple microscope, including bacteria,
protozoa, and sperm cells. Hooke observed non-living cork cells; Virchow added
"omnis cellula e cellula"; Pasteur disproved spontaneous generation.
Why Wrong: A observed cork cells, C/D made other contributions.
Q5. The phrase "Omnis cellula e cellula" means:
• A) All cells are identical
• B) All cells arise from pre-existing cells
• C) Cells are the basic unit of life
• D) All organisms are composed of cells
,Rationale: Rudolf Virchow's famous statement "Omnis cellula e cellula" translates
to "every cell from a cell," establishing that all cells arise from pre-existing cells
through cell division.
Why Wrong: A is incorrect, C describes basic unit concept, D describes organism
composition.
Q6. Which of the following is the correct order of biological organization from
simplest to most complex?
• A) Organelle → Cell → Tissue → Organ → Organism
• B) Cell → Organelle → Tissue → Organ → Organism
• C) Organelle → Cell → Organ → Tissue → Organism
• D) Tissue → Cell → Organelle → Organ → Organism
Rationale: The correct biological hierarchy is: Organelle (subcellular structure) →
Cell (basic unit) → Tissue (group of similar cells) → Organ (group of tissues) →
Organism (complete individual). This represents increasing levels of structural
complexity.
Why Wrong: A, C, D have incorrect ordering of organelle, cell, tissue, and organ.
Q7. The surface area-to-volume ratio is important to cells because:
• A) It limits the size a cell can attain
• B) It determines the cell's color
• C) It affects the cell's shape only
• D) It determines the cell's genetic material
Rationale: As a cell grows larger, its volume increases faster than its surface area,
reducing the ratio. A smaller surface area-to-volume ratio limits nutrient uptake
and waste removal, imposing a maximum size limit on cells.
Why Wrong: B, C, D are not related to surface area-to-volume ratio.
Q8. Which of the following is NOT a characteristic of all living cells?
, • A) Ability to reproduce
• B) Ability to respond to stimuli
• C) Ability to maintain homeostasis
• D) Ability to photosynthesize
Rationale: All living cells share characteristics including reproduction, response to
stimuli, and maintaining homeostasis. Photosynthesis is NOT a universal
characteristic—only certain cells (plant cells, algae, cyanobacteria) can
photosynthesize.
Why Wrong: A, B, C are universal characteristics of living cells.
Q9. The three tenets of classical cell theory were developed by:
• A) Hooke, van Leeuwenhoek, and Pasteur
• B) Schleiden, Schwann, and Virchow
• C) Darwin, Mendel, and Watson
• D) Koch, Pasteur, and Lister
Rationale: The classical cell theory was developed by Matthias Schleiden (plants
are made of cells), Theodor Schwann (animals are made of cells), and Rudolf
Virchow (cells arise from pre-existing cells).
Why Wrong: A describes early microscopists, C/D are from other fields.
Q10. The resolution of a microscope refers to:
• A) The magnification power
• B) The ability to distinguish two close objects as separate
• C) The brightness of the image
• D) The color of the image
Rationale: Resolution (resolving power) is the ability of a microscope to
distinguish two closely spaced objects as separate entities. Magnification is the
enlargement of the image; brightness and color are image quality features.
Why Wrong: A is magnification, C/D are image quality features.
Pasadena City College | Foundational Cell
Biology Assessment Questions with Complete
Answers & Detailed Rationales
Q1. The cell theory states that all living organisms are composed of:
• A) Cells
• B) Tissues
• C) Organs
• D) Molecules
Rationale: The cell theory establishes that cells are the fundamental structural and
functional units of all living organisms. Cells are the smallest units that can carry
out all life processes. Tissues and organs are composed of cells, and molecules are
the chemical building blocks within cells.
Why Wrong: B, C, D represent higher levels of biological organization or
chemical components, not the fundamental unit of life.
Q2. Which of the following is NOT a component of the modern cell theory?
• A) All living organisms are composed of one or more cells
• B) The cell is the basic unit of life
• C) Cells arise from non-living matter spontaneously
• D) All cells arise from pre-existing cells
Rationale: The modern cell theory includes three principles: 1) All living
organisms are composed of cells, 2) The cell is the basic unit of life, and 3) All
cells arise from pre-existing cells. Spontaneous generation (cells arising from non-
living matter) was disproven by Pasteur and others.
Why Wrong: A, B, D are all components of modern cell theory.
,Q3. Who was the first scientist to observe and describe cells?
• A) Antonie van Leeuwenhoek
• B) Robert Hooke
• C) Matthias Schleiden
• D) Theodor Schwann
Rationale: Robert Hooke first observed and described cells in 1665 using a
compound microscope to examine a thin slice of cork, coining the term "cell." Van
Leeuwenhoek observed living microorganisms; Schleiden and Schwann
contributed to cell theory later.
Why Wrong: A observed microorganisms, C/D contributed to cell theory later.
Q4. Which scientist is credited with first observing living microorganisms?
• A) Robert Hooke
• B) Antonie van Leeuwenhoek
• C) Rudolf Virchow
• D) Louis Pasteur
Rationale: Antonie van Leeuwenhoek was the first to observe living
microorganisms ("animalcules") using a simple microscope, including bacteria,
protozoa, and sperm cells. Hooke observed non-living cork cells; Virchow added
"omnis cellula e cellula"; Pasteur disproved spontaneous generation.
Why Wrong: A observed cork cells, C/D made other contributions.
Q5. The phrase "Omnis cellula e cellula" means:
• A) All cells are identical
• B) All cells arise from pre-existing cells
• C) Cells are the basic unit of life
• D) All organisms are composed of cells
,Rationale: Rudolf Virchow's famous statement "Omnis cellula e cellula" translates
to "every cell from a cell," establishing that all cells arise from pre-existing cells
through cell division.
Why Wrong: A is incorrect, C describes basic unit concept, D describes organism
composition.
Q6. Which of the following is the correct order of biological organization from
simplest to most complex?
• A) Organelle → Cell → Tissue → Organ → Organism
• B) Cell → Organelle → Tissue → Organ → Organism
• C) Organelle → Cell → Organ → Tissue → Organism
• D) Tissue → Cell → Organelle → Organ → Organism
Rationale: The correct biological hierarchy is: Organelle (subcellular structure) →
Cell (basic unit) → Tissue (group of similar cells) → Organ (group of tissues) →
Organism (complete individual). This represents increasing levels of structural
complexity.
Why Wrong: A, C, D have incorrect ordering of organelle, cell, tissue, and organ.
Q7. The surface area-to-volume ratio is important to cells because:
• A) It limits the size a cell can attain
• B) It determines the cell's color
• C) It affects the cell's shape only
• D) It determines the cell's genetic material
Rationale: As a cell grows larger, its volume increases faster than its surface area,
reducing the ratio. A smaller surface area-to-volume ratio limits nutrient uptake
and waste removal, imposing a maximum size limit on cells.
Why Wrong: B, C, D are not related to surface area-to-volume ratio.
Q8. Which of the following is NOT a characteristic of all living cells?
, • A) Ability to reproduce
• B) Ability to respond to stimuli
• C) Ability to maintain homeostasis
• D) Ability to photosynthesize
Rationale: All living cells share characteristics including reproduction, response to
stimuli, and maintaining homeostasis. Photosynthesis is NOT a universal
characteristic—only certain cells (plant cells, algae, cyanobacteria) can
photosynthesize.
Why Wrong: A, B, C are universal characteristics of living cells.
Q9. The three tenets of classical cell theory were developed by:
• A) Hooke, van Leeuwenhoek, and Pasteur
• B) Schleiden, Schwann, and Virchow
• C) Darwin, Mendel, and Watson
• D) Koch, Pasteur, and Lister
Rationale: The classical cell theory was developed by Matthias Schleiden (plants
are made of cells), Theodor Schwann (animals are made of cells), and Rudolf
Virchow (cells arise from pre-existing cells).
Why Wrong: A describes early microscopists, C/D are from other fields.
Q10. The resolution of a microscope refers to:
• A) The magnification power
• B) The ability to distinguish two close objects as separate
• C) The brightness of the image
• D) The color of the image
Rationale: Resolution (resolving power) is the ability of a microscope to
distinguish two closely spaced objects as separate entities. Magnification is the
enlargement of the image; brightness and color are image quality features.
Why Wrong: A is magnification, C/D are image quality features.
