NLN NEX A&P Comprehensive Exam Questions and
Answers with Rationales 2026/2027 Update
Foundations, Cells, Tissues & Integumentary System
1. Which level of organization is the smallest level capable of
independently carrying out all basic life processes?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the basic structural and functional unit of life and
can perform metabolism, growth, reproduction, and responsiveness.
2. Which organelle is primarily responsible for producing ATP?
A. Ribosome
B. Mitochondrion
C. Lysosome
D. Golgi apparatus
Answer: B. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through aerobic
cellular respiration.
3. Which organelle synthesizes proteins?
A. Ribosome
B. Lysosome
,C. Centriole
D. Peroxisome
Answer: A. Ribosome
Rationale: Ribosomes translate messenger RNA into proteins.
4. What is the primary function of the plasma membrane?
A. Produce ATP
B. Control movement into and out of the cell
C. Store genetic information
D. Digest cellular waste
Answer: B. Control movement into and out of the cell
Rationale: The selectively permeable plasma membrane regulates
substances entering and leaving the cell.
5. Movement of molecules from an area of higher concentration to an
area of lower concentration is called:
A. Active transport
B. Diffusion
C. Filtration
D. Endocytosis
Answer: B. Diffusion
Rationale: Diffusion is passive movement down a concentration
gradient and does not require cellular ATP.
6. Which process requires ATP to move substances against a
concentration gradient?
A. Osmosis
,B. Simple diffusion
C. Active transport
D. Facilitated diffusion
Answer: C. Active transport
Rationale: Active transport uses cellular energy to move substances
against their electrochemical gradients.
7. Osmosis refers specifically to the movement of:
A. Proteins
B. Water
C. Glucose
D. Sodium ions
Answer: B. Water
Rationale: Osmosis is the passive movement of water across a
selectively permeable membrane.
8. A cell placed in a hypertonic solution will generally:
A. Swell
B. Burst
C. Shrink
D. Remain unchanged
Answer: C. Shrink
Rationale: A hypertonic extracellular solution has a higher solute
concentration, causing water to leave the cell.
9. Which cellular structure contains DNA?
A. Nucleus
, B. Golgi apparatus
C. Ribosome
D. Lysosome
Answer: A. Nucleus
Rationale: In eukaryotic cells, most genetic material is contained within
the nucleus.
10. What is apoptosis?
A. Uncontrolled cell division
B. Programmed cell death
C. Cell swelling
D. Cellular inflammation
Answer: B. Programmed cell death
Rationale: Apoptosis is a regulated process that eliminates damaged or
unnecessary cells.
11. Which tissue type covers body surfaces and lines internal cavities?
A. Muscle
B. Nervous
C. Epithelial
D. Connective
Answer: C. Epithelial
Rationale: Epithelial tissue forms coverings, linings, and many glands.
12. Which tissue type is specialized for transmitting electrical signals?
A. Epithelial
B. Nervous
Answers with Rationales 2026/2027 Update
Foundations, Cells, Tissues & Integumentary System
1. Which level of organization is the smallest level capable of
independently carrying out all basic life processes?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the basic structural and functional unit of life and
can perform metabolism, growth, reproduction, and responsiveness.
2. Which organelle is primarily responsible for producing ATP?
A. Ribosome
B. Mitochondrion
C. Lysosome
D. Golgi apparatus
Answer: B. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through aerobic
cellular respiration.
3. Which organelle synthesizes proteins?
A. Ribosome
B. Lysosome
,C. Centriole
D. Peroxisome
Answer: A. Ribosome
Rationale: Ribosomes translate messenger RNA into proteins.
4. What is the primary function of the plasma membrane?
A. Produce ATP
B. Control movement into and out of the cell
C. Store genetic information
D. Digest cellular waste
Answer: B. Control movement into and out of the cell
Rationale: The selectively permeable plasma membrane regulates
substances entering and leaving the cell.
5. Movement of molecules from an area of higher concentration to an
area of lower concentration is called:
A. Active transport
B. Diffusion
C. Filtration
D. Endocytosis
Answer: B. Diffusion
Rationale: Diffusion is passive movement down a concentration
gradient and does not require cellular ATP.
6. Which process requires ATP to move substances against a
concentration gradient?
A. Osmosis
,B. Simple diffusion
C. Active transport
D. Facilitated diffusion
Answer: C. Active transport
Rationale: Active transport uses cellular energy to move substances
against their electrochemical gradients.
7. Osmosis refers specifically to the movement of:
A. Proteins
B. Water
C. Glucose
D. Sodium ions
Answer: B. Water
Rationale: Osmosis is the passive movement of water across a
selectively permeable membrane.
8. A cell placed in a hypertonic solution will generally:
A. Swell
B. Burst
C. Shrink
D. Remain unchanged
Answer: C. Shrink
Rationale: A hypertonic extracellular solution has a higher solute
concentration, causing water to leave the cell.
9. Which cellular structure contains DNA?
A. Nucleus
, B. Golgi apparatus
C. Ribosome
D. Lysosome
Answer: A. Nucleus
Rationale: In eukaryotic cells, most genetic material is contained within
the nucleus.
10. What is apoptosis?
A. Uncontrolled cell division
B. Programmed cell death
C. Cell swelling
D. Cellular inflammation
Answer: B. Programmed cell death
Rationale: Apoptosis is a regulated process that eliminates damaged or
unnecessary cells.
11. Which tissue type covers body surfaces and lines internal cavities?
A. Muscle
B. Nervous
C. Epithelial
D. Connective
Answer: C. Epithelial
Rationale: Epithelial tissue forms coverings, linings, and many glands.
12. Which tissue type is specialized for transmitting electrical signals?
A. Epithelial
B. Nervous
