Hole's Anatomy & Physiology Chapter 3 Exam – McGraw Hill Education – 2026/2027 Edition – Questions and Answers for Undergraduate Nursing and Allied Health Students

Hole's Anatomy & Physiology Chapter 3 Exam –
McGraw Hill Education – 2026/2027 Edition –
Questions and Answers for Undergraduate
Nursing and Allied Health Students




Section 1: Cell Basics and Structure

1. What is the basic structural unit of the body?

 A) Tissue
 B) Organ
 C) Organelle
 D) Cell

Answer: D) Cell
Rationale: The cell is the most basic unit of structure and function in the body. Tissues are
groups of cells, organs are composed of tissues, and organelles are structures within cells .




2. A cell is measured in which unit?

 A) Millimeters
 B) Micrometers
 C) Nanometers
 D) Centimeters

, Answer: B) Micrometers
Rationale: Cells are microscopic structures measured in micrometers (μm) due to their
small size .




3. Cells that have developed specialized characteristics are called:

 A) Prokaryotic
 B) Stem cells
 C) Differentiated
 D) Undifferentiated

Answer: C) Differentiated
Rationale: Differentiated cells have developed specialized characteristics and functions.
Stem cells remain undifferentiated until they receive signals to specialize .




4. A composite cell shows which three main components found in most cells?

 A) Nucleus, cytoplasm, and cell membrane
 B) Nucleus, mitochondria, and ribosomes
 C) Cell membrane, Golgi apparatus, and ER
 D) Cytoplasm, nucleus, and organelles

Answer: A) Nucleus, cytoplasm, and cell membrane
Rationale: The three main parts of a cell are the nucleus (control center), cytoplasm
(contents between nucleus and membrane), and cell membrane (outer boundary) .

, 5. The cell membrane is described as selectively permeable. This means it:

 A) Allows all substances to pass freely
 B) Prevents all substances from entering
 C) Regulates entry and exit of substances
 D) Only allows water to pass through

Answer: C) Regulates entry and exit of substances
Rationale: Selectively permeable means the membrane regulates what enters and exits the
cell, allowing some substances to pass while excluding others .




6. The cell membrane is primarily composed of:

 A) A protein monolayer
 B) A phospholipid bilayer
 C) A carbohydrate layer
 D) Nucleic acids

Answer: B) A phospholipid bilayer
Rationale: The cell membrane framework consists of a double layer of phospholipids with
hydrophobic fatty acid tails facing inward and hydrophilic phosphate heads facing
outward .




7. The hydrophobic tails of phospholipids:

 A) Are water-soluble and face outward
 B) Form the interior of the membrane and are NOT water-soluble
 C) Are water-soluble and form the interior

,  D) Are found only on the exterior surface

Answer: B) Form the interior of the membrane and are NOT water-soluble
Rationale: Hydrophobic means "water-fearing" or not water-soluble. The fatty acid tails
are hydrophobic and form the interior of the bilayer .




8. The hydrophilic heads of phospholipids:

 A) Are water-soluble and face the exterior surfaces
 B) Are NOT water-soluble and form the interior
 C) Are found only in the cytoplasm
 D) Repel water molecules

Answer: A) Are water-soluble and face the exterior surfaces
Rationale: Hydrophilic means "water-loving" or water-soluble. The phosphate heads are
hydrophilic and face the exterior and interior surfaces of the membrane .




9. Signal transduction refers to the cell's ability to:

 A) Transport nutrients across the membrane
 B) Receive and respond to messages
 C) Divide and reproduce
 D) Produce energy from nutrients

Answer: B) Receive and respond to messages
Rationale: Signal transduction permits the cell to receive and respond to messages from its
environment, such as hormones binding to receptors .