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Exam 1: NURS231/ NURS 231 (Latest 2026/ 2027 Update) Pathophysiology: Cellular Adaptation, Injury, and Inflammation Review| Practice Questions with Verified Answers and Detailed Rationales| Grade A| 100% Correct (Verified Solutions) – Portage Learning

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INSTANT PDF DOWNLOAD — This comprehensive practice test for NURS 231 Exam 1 at Portage Learning covers Pathophysiology for the 2026/2027 academic year first examination. It features practice questions with verified answers and detailed rationales in multiple-choice, select-all-that-apply, true/false, and short answer formats aligned with the Portage Learning nursing curriculum. CELLULAR BIOLOGY FUNDAMENTALS (EXAM 1 FOCUS) Basic Cellular Structures and Functions Question 1: Cell Membrane Composition The cell membrane is primarily composed of: A) A single layer of phospholipids with embedded proteins B) A phospholipid bilayer with hydrophobic tails facing outward and hydrophilic heads facing inward C) A phospholipid bilayer with hydrophilic heads facing the aqueous environments and hydrophobic tails facing each other D) A protein bilayer with embedded phospholipids Correct Answer: C Rationale: The cell membrane (plasma membrane) consists of a phospholipid bilayer. The hydrophilic (water-loving) phosphate heads face outward toward the aqueous intracellular and extracellular environments. The hydrophobic (water-fearing) fatty acid tails face each other, away from water. This arrangement creates a semipermeable barrier. Embedded proteins serve functions such as transport, cell recognition, and enzymatic activity. The fluid mosaic model describes this dynamic structure. Question 2: Nucleus Function The primary function of the nucleus is to: A) Synthesize proteins B) Generate ATP through cellular respiration C) Store and protect the cell's genetic material (DNA) D) Package and modify proteins for secretion Correct Answer: C Rationale: The nucleus contains the cell's chromosomal DNA, which carries the genetic blueprint for protein synthesis and cellular regulation. It is enclosed by a double membrane (nuclear envelope) with nuclear pores that regulate transport between the nucleus and cytoplasm. The nucleolus within the nucleus is responsible for ribosome synthesis. Protein synthesis (A) occurs at ribosomes. ATP generation (B) occurs in mitochondria. Protein packaging/modification (D) occurs in the Golgi apparatus. Question 3: Mitochondria Which statement about mitochondria is accurate? A) Mitochondria are responsible for lipid synthesis and detoxification B) Mitochondria convert glucose into ATP through aerobic cellular respiration C) Mitochondria contain their own DNA that is inherited from both parents D) Mitochondria are the site of protein synthesis Correct Answer: B Rationale: Mitochondria are the "powerhouses" of the cell, generating ATP through aerobic cellular respiration (Krebs cycle and electron transport chain). The inner membrane forms cristae to increase surface area for ATP production. Mitochondria contain their own circular DNA (mtDNA), which is inherited maternally (from the mother). Cells with high energy demands (muscle, nerve, liver) contain more mitochondria. Statement C is incorrect because mtDNA is inherited from the mother only (maternal inheritance not both parents). Question 4: Ribosomes Ribosomes are responsible for: A) Lipid synthesis and detoxification of drugs B) Packaging of proteins into vesicles for secretion C) Protein synthesis (translation of mRNA) D) Breakdown of cellular waste and pathogens Correct Answer: C Rationale: Ribosomes are composed of rRNA and protein. They translate messenger RNA (mRNA) sequences into polypeptide chains, the process of protein synthesis. Ribosomes can be free in the cytoplasm (synthesizing proteins for intracellular use) or attached to the rough endoplasmic reticulum (synthesizing proteins for secretion or membrane incorporation). Lipid synthesis and detoxification (A) occur in smooth ER. Packaging (B) occurs in Golgi apparatus. Breakdown (D) occurs in lysosomes and proteasomes. Question 5: Endoplasmic Reticulum Rough endoplasmic reticulum (RER) is distinguished from smooth endoplasmic reticulum (SER) by the presence of:

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NURS 231 Pathophysiology Exam 1 2026/2027

Questions | Verified Answers | Detailed Rationales |

Grade A | Portage Learning



1. What is community-based nursing?
Correct Answer: Community-based nursing is the application of the nursing
process and caring for individuals, families, and groups where they live, work,
or go to school or as they move through the healthcare system.
Rationale:
1. Community-based nursing focuses on individuals and families in their own
environments.
2. This is a standard community health nursing definition question.


2. What is public health nursing?
Correct Answer: Public health nursing is the practice of promoting and
protecting the health of populations (towns, cities, countries) using
knowledge from nursing, social, and public health sciences.
Rationale:
1. Public health nursing focuses on entire populations rather than individuals.
2. This is a standard community health nursing definition question.


3. What are the three levels of prevention?
Correct Answer: Primary, secondary, and tertiary prevention.

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Rationale:
1. These are the three classic levels of prevention in public health.
2. This is a standard community health nursing question.


4. What is primary prevention?
Correct Answer: Primary prevention includes efforts to prevent an injury or
illness from ever occurring.
Rationale:
1. Primary prevention occurs before disease onset.
2. Examples include immunizations and health education.
3. This is a standard prevention levels question.


5. What is tertiary prevention?
Correct Answer: Tertiary prevention minimizes severity and disability from
disease through appropriate therapy for chronic disease.
Rationale:
1. Tertiary prevention occurs after disease is established.
2. Examples include rehabilitation and chronic disease management.
3. This is a standard prevention levels question.


6. What is secondary prevention?
Correct Answer: Secondary prevention focuses on early identification of
individuals or communities experiencing illness, providing treatment, and
conducting activities that are geared to prevent worsening health status.
Examples include communicable disease screening and case finding, early

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detection and treatment of diabetes, and exercise programs for older adult
clients who are frail.
Rationale:
1. Secondary prevention occurs during early disease stages.
2. Examples include screening programs.
3. This is a standard prevention levels question.


7. What is the definition of social determinants of health (SDOH)?
Correct Answer: Social determinants of health are conditions in the
environment where people are born, live, learn, work, play, worship, and age
that affect a wide range of health, functioning, and quality-of-life outcomes
and risk.
Rationale:
1. SDOH are upstream factors that influence health.
2. This is a standard public health definition question.


8. What are the five domains of SDOH?
Correct Answer: 1. Economic stability; 2. Education access and quality; 3.
Health care access and quality; 4. Neighborhood and built environment; 5.
Social and community context.
Rationale:
1. These five domains are from Healthy People 2030.
2. This is a standard public health question.


9. What is the PHN intervention wheel definition?

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