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Question 1. Which segment of the nephron is primarily responsible for most of the reabsorption of sodium, water, glucose, and amino acids? A) Loop of Henle B) Proximal convoluted tubule C) Distal convoluted tubule D) Collecting duct Answer: B Explanation: The proximal convoluted tubule reabsorbs approximately 65-70% of filtered sodium, water, glucose, and amino acids through active and passive mechanisms, making it the primary site for bulk reabsorption. Question 2. Which part of the nephron is mainly involved in countercurrent multiplication and urine concentration? A) Distal tubule B) Loop of Henle C) Proximal tubule D) Collecting duct Answer: B Explanation: The Loop of Henle establishes a concentration gradient via countercurrent multiplication, essential for urine concentration and dilution. Question 3. Which hormone is chiefly responsible for stimulating sodium reabsorption in the distal nephron and collecting duct? A) Antidiuretic hormone (ADH) B) Aldosterone C) Erythropoietin D) Parathyroid hormone Answer: B Explanation: Aldosterone promotes sodium reabsorption and potassium excretion in the distal tubule and collecting duct by increasing the activity of sodium channels and Na+/K+ ATPase.
Question 4. Which of the following best describes the primary determinant of Glomerular Filtration Rate (GFR)? A) Renal blood flow B) Glomerular capillary hydrostatic pressure C) Tubular hydrostatic pressure D) Plasma oncotic pressure Answer: B Explanation: The hydrostatic pressure within glomerular capillaries is the main driving force for filtration, directly influencing GFR. Question 5. Which measurement method estimates GFR based on the clearance of endogenous creatinine? A) Inulin clearance B) Creatinine clearance C) Cystatin C D) Serum BUN Answer: B Explanation: Creatinine clearance, calculated from serum creatinine and urine collection, provides an estimate of GFR and is routinely used in clinical practice. Question 6. Which of the following is a mechanism of autoregulation of renal blood flow? A) Sympathetic nerve activation B) Myogenic response C) Aldosterone secretion D) Renin release Answer: B Explanation: The myogenic response, where vascular smooth muscle constricts in response to increased pressure, helps maintain stable renal blood flow despite fluctuations in systemic blood pressure. Question 7. Which transporter is predominantly responsible for bicarbonate reabsorption in the proximal tubule?
C) Renin D) Vasopressin Answer: B Explanation: Erythropoietin, produced mainly by peritubular interstitial cells in the kidney, stimulates red blood cell production in the bone marrow. Question 11. Vitamin D metabolism in the kidney results in the formation of which active form? A) 25-hydroxyvitamin D B) 1,25-dihydroxyvitamin D (calcitriol) C) Vitamin D D) Cholecalciferol Answer: B Explanation: The proximal tubule converts 25-hydroxyvitamin D into the active form, 1,25- dihydroxyvitamin D (calcitriol), which promotes calcium absorption. Question 12. Which immune component plays a central role in the development of immune complex- mediated glomerulonephritis? A) T lymphocytes B) Complement system C) Neutrophils D) Mast cells Answer: B Explanation: The complement system is activated by immune complexes deposited in the glomeruli, leading to inflammation and injury characteristic of immune complex-mediated glomerulonephritis. Question 13. Which of the following is the most common cause of prerenal acute kidney injury? A) Renal artery stenosis B) Dehydration C) Glomerulonephritis D) Urinary obstruction
Answer: B Explanation: Dehydration reduces effective circulating volume, decreasing renal perfusion and causing prerenal AKI. Question 14. Which biomarker is considered more sensitive and earlier in detecting AKI than serum creatinine? A) Blood urea nitrogen (BUN) B) Cystatin C C) Serum sodium D) Serum potassium Answer: B Explanation: Cystatin C is a low-molecular-weight protein filtered by the glomeruli and less influenced by muscle mass, making it a sensitive early marker for AKI. Question 15. Which of the following is a typical feature of acute tubular necrosis (ATN)? A) Rapid onset of proteinuria and hypoalbuminemia B) Muddy brown granular casts on urinalysis C) Significant hematuria with dysmorphic RBCs D) Uniformly increased glomerular size on biopsy Answer: B Explanation: Muddy brown granular casts are characteristic of ATN, reflecting necrotic tubular epithelial cells sloughed into the tubule lumen. Question 16. Which classification system is used to stage CKD based on GFR? A) KDIGO guidelines B) RIFLE criteria C) AKIN criteria D) WHO staging Answer: A
Question 20. Which is a common neurological manifestation in advanced CKD caused by uremic toxins? A) Seizures B) Uremic encephalopathy C) Parkinsonism D) Peripheral neuropathy Answer: B Explanation: Uremic encephalopathy results from accumulation of neurotoxins, leading to cognitive impairment, confusion, and coma in advanced CKD. Question 21. Which management strategy is most effective in slowing CKD progression? A) Use of high-protein diet B) Blood pressure control with RAAS blockade C) Discontinuation of all antihypertensives D) Increasing dietary phosphate intake Answer: B Explanation: Blood pressure control, particularly with RAAS inhibitors, reduces intraglomerular pressure and slows CKD progression. Question 22. Which glomerular disease is characterized by significant proteinuria, hypoalbuminemia, edema, and hyperlipidemia and often responds to corticosteroids? A) Focal segmental glomerulosclerosis B) Minimal change disease C) Membranous nephropathy D) Diabetic nephropathy Answer: B Explanation: Minimal change disease presents with nephrotic syndrome features and is highly responsive to corticosteroids, especially in children. Question 23. Which of the following best describes IgA nephropathy (Berger's disease)?
A) Rapidly progressive glomerulonephritis with anti-GBM antibodies B) Hematuria following mucosal infections C) Membranous immune deposits D) Electron-dense deposits in subendothelial space Answer: B Explanation: IgA nephropathy characteristically causes episodic hematuria that often follows mucosal infections like respiratory or gastrointestinal illnesses. Question 24. Which serological marker is most specific for anti-GBM glomerulonephritis? A) ANA B) Anti-dsDNA C) Anti-GBM antibodies D) ANCA Answer: C Explanation: Anti-GBM antibodies are specific for Goodpasture's syndrome, causing rapidly progressive glomerulonephritis with pulmonary involvement. Question 25. Which immunosuppressive agent is commonly used in the treatment of severe proliferative glomerulonephritis? A) Antibiotics B) Cyclophosphamide C) Antibiotics D) Diuretics Answer: B Explanation: Cyclophosphamide, often combined with corticosteroids, is used for severe cases of proliferative glomerulonephritis, such as rapidly progressive glomerulonephritis. Question 26. Which drug is most commonly implicated in drug-induced acute interstitial nephritis (AIN)? A) NSAIDs B) Penicillins
Explanation: E. coli is the most common pathogen causing urinary tract infections, including pyelonephritis. Question 30. Which cystic kidney disease is inherited in an autosomal dominant pattern and leads to progressive renal failure? A) Autosomal dominant polycystic kidney disease (ADPKD) B) Autosomal recessive polycystic kidney disease (ARPKD) C) Medullary cystic kidney disease D) Acquired cystic kidney disease Answer: A Explanation: ADPKD is inherited in an autosomal dominant manner, characterized by multiple renal cysts and progressive decline in renal function. Question 31. Which gene mutation is most commonly associated with ADPKD? A) PKD B) PKD C) COL4A D) MYH Answer: A Explanation: Mutations in PKD1 account for the majority of ADPKD cases, leading to cyst formation and progressive renal failure. Question 32. Which of the following is a hallmark feature of nephrotic syndrome? A) Hematuria and hypertension B) Massive proteinuria (>3.5 g/day) C) Rapid decline in renal function D) Hematuria with dysmorphic RBCs Answer: B Explanation: Nephrotic syndrome is characterized by heavy proteinuria (>3.5 g/day), hypoalbuminemia, edema, and hyperlipidemia.
Question 33. Which glomerular lesion is most characteristic of diabetic nephropathy? A) Kimmelstiel-Wilson nodules B) Crescents C) Wire-loop lesions D) Subepithelial immune deposits Answer: A Explanation: Kimmelstiel-Wilson nodules are hyaline mesangial sclerosis characteristic of diabetic nephropathy. Question 34. Which feature distinguishes nephritic syndrome from nephrotic syndrome? A) Heavy proteinuria with hypoalbuminemia B) Hematuria and hypertension C) Edema D) Hyperlipidemia Answer: B Explanation: Nephritic syndrome involves hematuria, hypertension, and often some proteinuria, whereas nephrotic syndrome primarily involves heavy proteinuria and hypoalbuminemia. Question 35. Which of the following is characteristic of rapidly progressive glomerulonephritis (RPGN)? A) Crescents in glomeruli on biopsy B) Extensive sclerosis without cellular proliferation C) Isolated hematuria D) Minimal proteinuria Answer: A Explanation: The presence of crescents in glomeruli indicates severe glomerular injury typical of RPGN, leading to rapid loss of renal function. Question 36. Which antibody is associated with Goodpasture's syndrome? A) Anti-GBM
D) Focal segmental glomerulosclerosis Answer: A Explanation: MPGN features mesangial and basement membrane proliferation with immune complex deposits producing the characteristic tram-track appearance. Question 40. Which factor is most strongly associated with secondary glomerular diseases such as HIV- associated nephropathy? A) Viral infection B) Autoimmune disease C) Bacterial infection D) Genetic mutation Answer: A Explanation: HIV infection is a key risk factor for HIVAN, a collapsing form of focal segmental glomerulosclerosis. Question 41. In acute interstitial nephritis, which cell type is prominently involved in the hypersensitivity response? A) Eosinophils B) Neutrophils C) Lymphocytes D) Macrophages Answer: A Explanation: Eosinophils are characteristic of hypersensitivity reactions seen in drug-induced AIN. Question 42. Which of the following is a common causative agent of bacterial pyelonephritis? A) Escherichia coli B) Streptococcus pneumoniae C) Pseudomonas aeruginosa D) Staphylococcus saprophyticus Answer: A
Explanation: E. coli is the predominant pathogen causing bacterial pyelonephritis, especially in women. Question 43. Which of the following is a characteristic feature of autosomal recessive polycystic kidney disease (ARPKD)? A) Multiple bilateral renal cysts with preserved kidney function early in life B) Large, cystic kidneys in infancy with hepatic fibrosis C) Unilateral cystic kidney with hypertension D) Cystic degeneration limited to cortex Answer: B Explanation: ARPKD presents in infancy with bilaterally enlarged cystic kidneys and is often associated with congenital hepatic fibrosis. Question 44. Which of the following best describes the main pathology of Balkan endemic nephropathy? A) Heavy metal toxicity B) Urothelial carcinoma C) Chronic tubulointerstitial nephritis due to environmental toxins D) Polycystic degeneration Answer: C Explanation: Balkan endemic nephropathy is a chronic tubulointerstitial disease linked to environmental toxins, with a risk of urothelial tumors. Question 45. Which of the following is most characteristic of nephrotic syndrome in terms of lipid profile? A) Elevated LDL and VLDL B) Decreased HDL C) Decreased triglycerides D) Elevated HDL only Answer: A Explanation: Nephrotic syndrome features hyperlipidemia, particularly elevated LDL and VLDL, due to increased hepatic lipoprotein synthesis.
B) Urinary tract obstruction C) Hemorrhage D) Congestive heart failure Answer: A Explanation: Ischemia causing damage to renal tubular cells is the leading cause of intrinsic AKI, specifically ATN. Question 50. Which of the following is an indication for urgent renal replacement therapy in AKI? A) Persistent hyperkalemia B) Volume overload refractory to diuretics C) Severe metabolic acidosis D) All of the above Answer: D Explanation: All are indications for initiating renal replacement therapy in AKI to manage life-threatening complications. Question 51. Which of the following best describes the primary function of the juxtaglomerular apparatus? A) Filtration of plasma B) Regulation of glomerular filtration rate and blood pressure C) Reabsorption of glucose D) Secretion of erythropoietin Answer: B Explanation: The juxtaglomerular apparatus senses blood pressure and sodium levels to regulate GFR and renin secretion, thus controlling blood pressure. Question 52. Which transporter is mainly responsible for sodium reabsorption in the distal convoluted tubule? A) Na+/H+ exchanger B) Na+/Cl− cotransporter
C) Na+/K+ ATPase D) Aquaporin- 2 Answer: B Explanation: The Na+/Cl− cotransporter in the distal tubule reabsorbs sodium along with chloride, regulated by thiazide diuretics. Question 53. Which hormone increases calcium reabsorption in the distal tubule and is stimulated by PTH? A) Calcitonin B) Vitamin D (calcitriol) C) Parathyroid hormone D) Aldosterone Answer: C Explanation: PTH stimulates calcium reabsorption in the distal tubule by increasing the number of calcium channels. Question 54. Which of the following is a key feature of nephrotic syndrome? A) Hematuria B) Proteinuria >3.5 g/day C) Hypertension D) Decreased serum lipids Answer: B Explanation: Nephrotic syndrome involves heavy proteinuria (>3.5 g/day), leading to hypoalbuminemia and edema. Question 55. Which glomerular disease is characterized by subepithelial immune deposits and thickening of the basement membrane? A) Membranous nephropathy B) Focal segmental glomerulosclerosis C) Membranoproliferative glomerulonephritis
Explanation: Hematuria that occurs episodically after mucosal infections, especially respiratory, is characteristic of IgA nephropathy. Question 59. Which of the following treatments is most effective for rapidly progressive glomerulonephritis? A) Antibiotics B) Plasma exchange combined with immunosuppressants C) Diuretics D) ACE inhibitors alone Answer: B Explanation: Plasma exchange removes pathogenic antibodies, combined with immunosuppressives like corticosteroids or cyclophosphamide, to treat RPGN. Question 60. Which of the following is a common cause of secondary glomerulonephritis in HIV-infected patients? A) HIV-associated nephropathy (HIVAN) B) Membranous nephropathy C) Post-infectious glomerulonephritis D) IgA nephropathy Answer: A Explanation: HIVAN is a collapsing focal segmental glomerulosclerosis prevalent in HIV-infected individuals, causing proteinuria and rapid renal decline. Question 61. Which of the following drugs is most associated with causing acute interstitial nephritis? A) NSAIDs B) Penicillins C) PPIs D) All of the above Answer: D Explanation: NSAIDs, penicillins, and PPIs are common drugs that can induce hypersensitivity reactions leading to AIN.
Question 62. What is a classic urinalysis feature of acute interstitial nephritis? A) Eosinophils B) Red cell casts C) Dysmorphic RBCs D) Granular casts only Answer: A Explanation: Eosinophils in the urine are characteristic of hypersensitivity AIN, often seen with drug reactions. Question 63. Which of the following is most characteristic of chronic interstitial nephritis? A) Granulomas B) Interstitial fibrosis and tubular atrophy C) Crescents D) Mesangial proliferation Answer: B Explanation: Chronic interstitial nephritis features fibrosis and atrophy of tubules, leading to irreversible kidney damage. Question 64. Which bacterial pathogen is most common cause of acute pyelonephritis in women? A) Pseudomonas aeruginosa B) Escherichia coli C) Staphylococcus saprophyticus D) Enterococcus faecalis Answer: B Explanation: E. coli accounts for the majority of urinary tract infections, including pyelonephritis, especially in women. Question 65. Which cystic kidney disease is inherited in an autosomal recessive pattern and often manifests in infancy?
