Which of these cellular adaptations to stress is NOT generally considered a reliably reversible process?
Atrophy
Dysplasia
✓
Hyperplasia
Hypertrophy
Correct Answer
Dysplasia
The shared property is being a cellular adaptation that is generally reliably reversible. Atrophy, hypertrophy, and hyperplasia are typically reversible upon removal of the inciting stimulus. Dysplasia, while sometimes reversible, is characterized by disordered cell growth and is considered a preneoplastic lesion, making its reversal less reliable and often a precursor to malignancy.
Question 2
Which of these is NOT primarily a phagocytic cell involved in the immune response?
Dendritic cell
Plasma cell
✓
Macrophage
Neutrophil
Correct Answer
Plasma cell
The shared property is being a primary phagocytic cell. Macrophages, neutrophils, and dendritic cells are all professional phagocytes that engulf pathogens, cellular debris, or present antigens. Plasma cells are differentiated B lymphocytes whose primary function is the synthesis and secretion of antibodies, not phagocytosis.
Question 3
Which of these is NOT a cardinal sign of acute inflammation?
Dolor (pain)
Calor (heat)
Rubor (redness)
Fibrosis
✓
Correct Answer
Fibrosis
The shared property is being a cardinal sign of acute inflammation. Rubor (redness), calor (heat), and dolor (pain) are three of the five classic cardinal signs of inflammation (the others being tumor/swelling and functio laesa/loss of function). Fibrosis is a process of tissue repair characterized by collagen deposition, which can be an outcome of chronic inflammation or severe acute inflammation, but it is not a direct sign of the inflammatory process itself.
Question 4
Which of these types of necrosis is NOT primarily associated with bacterial infection?
Caseous necrosis
Liquefactive necrosis
Coagulative necrosis
✓
Gangrenous necrosis
Correct Answer
Coagulative necrosis
The shared property is being a type of necrosis commonly and primarily associated with bacterial infection. Liquefactive necrosis is characteristic of bacterial infections, especially in abscesses. Caseous necrosis is typical of tuberculosis, a bacterial infection. Gangrenous necrosis often involves bacterial superinfection, particularly in wet gangrene. Coagulative necrosis is primarily associated with ischemia (e.g., myocardial infarction) and is less characteristically linked to bacterial infection as its primary cause or presentation compared to the others.
Question 5
Which of these is NOT primarily a lipid-derived mediator of inflammation?
Histamine
✓
Prostaglandin
Leukotriene
Thromboxane
Correct Answer
Histamine
The shared property is being a lipid-derived mediator of inflammation. Prostaglandins, leukotrienes, and thromboxanes are all eicosanoids, which are lipid-derived mediators synthesized from arachidonic acid. Histamine is a vasoactive amine stored in mast cell granules and released early in inflammation, but it is not lipid-derived.
Question 6
Which of these immunoglobulins is NOT typically found as a monomer in its primary functional form in serum?
IgG
IgD
IgM
✓
IgE
Correct Answer
IgM
The shared property is being an immunoglobulin typically found as a monomer in its primary functional form in serum. IgG, IgE, and IgD all primarily function as monomers. IgM is typically found as a pentamer in serum, although it can exist as a monomer on the surface of B cells.
Question 7
Which of these conditions is NOT primarily mediated by a Type IV (delayed-type) hypersensitivity reaction?
Allergic rhinitis
✓
Contact dermatitis
Graft rejection (chronic)
Tuberculin reaction
Correct Answer
Allergic rhinitis
The shared property is being a condition primarily mediated by a Type IV hypersensitivity reaction. Contact dermatitis, the tuberculin reaction (PPD test), and chronic graft rejection are all classic examples of Type IV, cell-mediated, delayed-type hypersensitivity. Allergic rhinitis (hay fever) is a Type I (immediate) hypersensitivity reaction, mediated by IgE antibodies and mast cell degranulation.
Question 8
Which of these is NOT a common mechanism leading to intracellular accumulation of substances?
Inadequate removal of normal endogenous substance
Excessive synthesis of a foreign substance
✓
Defects in enzyme function for metabolism
Deposition of an abnormal exogenous substance
Correct Answer
Excessive synthesis of a foreign substance
The shared property is being a common mechanism for intracellular accumulations. Inadequate removal of normal endogenous substances (e.g., fatty change in the liver), defects in enzyme function leading to failure to degrade metabolites (e.g., lysosomal storage diseases), and deposition of abnormal exogenous substances (e.g., carbon particles in anthracosis) are all recognized mechanisms. Excessive synthesis of a foreign substance is not a recognized mechanism; foreign substances are typically introduced from outside the cell, not synthesized by it.
Question 9
Which of these is NOT a primary role of the complement system in immunity?
Chemotaxis
Cell lysis
Antibody production
✓
Opsonization
Correct Answer
Antibody production
The shared property is being a primary role of the complement system. Opsonization (facilitated by C3b), chemotaxis (mediated by C5a), and cell lysis (via the Membrane Attack Complex) are all major functions of the complement system in innate and adaptive immunity. Antibody production is the primary role of B lymphocytes and plasma cells, not the complement system.
Question 10
Which of these mechanisms of edema formation is NOT primarily due to a decrease in plasma oncotic pressure?
Heart failure leading to impaired venous return
✓
Liver failure leading to decreased albumin synthesis
Nephrotic syndrome with proteinuria
Severe protein malnutrition
Correct Answer
Heart failure leading to impaired venous return
The shared property is contributing to edema primarily due to a decrease in plasma oncotic pressure. Liver failure (decreased albumin synthesis), severe protein malnutrition, and nephrotic syndrome (proteinuria) all result in lower plasma protein levels, thereby reducing plasma oncotic pressure and causing fluid to shift into the interstitial space. Heart failure leading to impaired venous return causes edema primarily by increasing capillary hydrostatic pressure, not by decreasing oncotic pressure.
Question 11
Which of these cell types is NOT a primary component of the adaptive immune system?
Natural Killer (NK) cell
✓
Plasma cell
T lymphocyte
B lymphocyte
Correct Answer
Natural Killer (NK) cell
The shared property is being a primary component of the adaptive immune system. B lymphocytes, T lymphocytes, and plasma cells (differentiated B cells) are all key components of the adaptive (specific) immune system, responsible for antigen-specific responses and immunological memory. Natural Killer (NK) cells are lymphocytes, but they are part of the innate (non-specific) immune system, recognizing and killing target cells without prior sensitization.
Question 12
Which of these is NOT a common characteristic of malignant neoplasms?
Invasiveness
Anaplasia
Metastasis
Well-differentiated cells
✓
Correct Answer
Well-differentiated cells
The shared property is being a common characteristic of malignant neoplasms. Malignant tumors typically exhibit metastasis (the ability to spread to distant sites), invasiveness (infiltration of surrounding tissues), and anaplasia (loss of cellular differentiation). Well-differentiated cells are characteristic of benign neoplasms or normal tissue, while malignant cells tend to be poorly differentiated or anaplastic.
Question 13
Which of these conditions is NOT primarily classified as a systemic autoimmune disease?
Rheumatoid arthritis
Systemic lupus erythematosus (SLE)
Multiple sclerosis
Ulcerative colitis
✓
Correct Answer
Ulcerative colitis
The shared property is being a systemic autoimmune disease. Rheumatoid arthritis, Systemic lupus erythematosus (SLE), and Multiple sclerosis are all classified as systemic autoimmune diseases, where the immune system attacks various tissues and organs throughout the body. Ulcerative colitis is an inflammatory bowel disease primarily affecting the colon, and while it has an autoimmune component and can have systemic manifestations, it is not typically classified as a systemic autoimmune disease in the same broad sense as the others, being more localized to the GI tract.
Question 14
Which of these is NOT considered a primary indicator of irreversible cellular injury?
Lysosomal membrane damage
Severe mitochondrial dysfunction
Depletion of ATP
✓
Plasma membrane damage
Correct Answer
Depletion of ATP
The shared property is being a primary indicator or mechanism directly leading to *irreversible* cellular damage. Severe mitochondrial dysfunction (leading to inability to generate ATP), plasma membrane damage (leading to loss of osmotic regulation), and lysosomal membrane damage (leading to leakage of destructive enzymes) are all critical points of no return that signify irreversible injury. While depletion of ATP is a crucial initial event in cellular injury, it can occur in reversible injury; sustained and severe ATP depletion *contributes* to irreversible damage but is not, by itself, the *irreversible* step in the same way that severe organelle membrane damage is.
Question 15
Which of these substances is NOT primarily involved in the immediate vascular response during acute inflammation?
Bradykinin
Fibrinogen
✓
Prostaglandins
Histamine
Correct Answer
Fibrinogen
The shared property is being a mediator primarily involved in the immediate vascular response (vasodilation, increased permeability) during acute inflammation. Histamine is released from mast cells and causes immediate vasodilation and increased vascular permeability. Bradykinin, formed from the kinin system, also causes vasodilation, increased permeability, and pain. Prostaglandins contribute to vasodilation and increased vascular permeability, as well as pain and fever. Fibrinogen is a plasma protein essential for blood clotting and forms a fibrin mesh in the extravascular space, which is part of the inflammatory exudate and barrier formation, but it is not a direct mediator of the *immediate vascular changes* like the others.