AB MT CHEMISTRY EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD PDF
1. What is the primary function of a buffer solution in clinical
chemistry?
A. To increase reaction speed
B. To maintain constant pH
C. To improve reagent color
D. To stabilize temperature
Answer: B
Buffers resist changes in pH and ensure reactions occur under optimal
conditions.
2. Which anticoagulant is preferred for plasma glucose testing?
A. EDTA
B. Heparin
C. Sodium fluoride/potassium oxalate
D. Citrate
Answer: C
Sodium fluoride inhibits glycolysis, preserving glucose levels.
,3. ALT is primarily found in which organ?
A. Heart
B. Liver
C. Kidney
D. Brain
Answer: B
ALT is most specific to hepatocellular injury.
4. What wavelength region does a typical spectrophotometer use for
visible light?
A. 100–300 nm
B. 400–700 nm
C. 700–900 nm
D. 900–1100 nm
Answer: B
Visible light is measured between 400 and 700 nm.
5. Which lipid is the primary carrier of cholesterol in the body?
A. HDL
B. IDL
C. Chylomicrons
D. LDL
Answer: D
LDL delivers cholesterol to tissues.
,6. A calibration curve is used to:
A. Improve precision
B. Determine analyte concentration
C. Reduce reagent volume
D. Control temperature
Answer: B
A calibration curve establishes a relationship between absorbance and
concentration.
7. Which enzyme is most specific for pancreatitis?
A. ALP
B. CK
C. Lipase
D. LDH
Answer: C
Lipase is the most sensitive and specific marker for pancreatitis.
8. What is the major cation of extracellular fluid?
A. Potassium
B. Magnesium
C. Sodium
D. Calcium
Answer: C
Sodium maintains extracellular fluid volume and osmotic balance.
, 9. Hemolysis most significantly elevates which analyte?
A. Calcium
B. Potassium
C. Sodium
D. Chloride
Answer: B
RBCs contain large amounts of potassium, released during hemolysis.
10. Which protein is the primary carrier of iron?
A. Albumin
B. Transferrin
C. Ferritin
D. Ceruloplasmin
Answer: B
Transferrin transports iron in plasma.
11. In ion-selective electrode measurement, what does the electrode
respond to?
A. Total ion concentration
B. Ion activity
C. Osmolality
D. pH only
Answer: B
ISEs measure ion activity, not total ion content.
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026
Q&A | INSTANT DOWNLOAD PDF
1. What is the primary function of a buffer solution in clinical
chemistry?
A. To increase reaction speed
B. To maintain constant pH
C. To improve reagent color
D. To stabilize temperature
Answer: B
Buffers resist changes in pH and ensure reactions occur under optimal
conditions.
2. Which anticoagulant is preferred for plasma glucose testing?
A. EDTA
B. Heparin
C. Sodium fluoride/potassium oxalate
D. Citrate
Answer: C
Sodium fluoride inhibits glycolysis, preserving glucose levels.
,3. ALT is primarily found in which organ?
A. Heart
B. Liver
C. Kidney
D. Brain
Answer: B
ALT is most specific to hepatocellular injury.
4. What wavelength region does a typical spectrophotometer use for
visible light?
A. 100–300 nm
B. 400–700 nm
C. 700–900 nm
D. 900–1100 nm
Answer: B
Visible light is measured between 400 and 700 nm.
5. Which lipid is the primary carrier of cholesterol in the body?
A. HDL
B. IDL
C. Chylomicrons
D. LDL
Answer: D
LDL delivers cholesterol to tissues.
,6. A calibration curve is used to:
A. Improve precision
B. Determine analyte concentration
C. Reduce reagent volume
D. Control temperature
Answer: B
A calibration curve establishes a relationship between absorbance and
concentration.
7. Which enzyme is most specific for pancreatitis?
A. ALP
B. CK
C. Lipase
D. LDH
Answer: C
Lipase is the most sensitive and specific marker for pancreatitis.
8. What is the major cation of extracellular fluid?
A. Potassium
B. Magnesium
C. Sodium
D. Calcium
Answer: C
Sodium maintains extracellular fluid volume and osmotic balance.
, 9. Hemolysis most significantly elevates which analyte?
A. Calcium
B. Potassium
C. Sodium
D. Chloride
Answer: B
RBCs contain large amounts of potassium, released during hemolysis.
10. Which protein is the primary carrier of iron?
A. Albumin
B. Transferrin
C. Ferritin
D. Ceruloplasmin
Answer: B
Transferrin transports iron in plasma.
11. In ion-selective electrode measurement, what does the electrode
respond to?
A. Total ion concentration
B. Ion activity
C. Osmolality
D. pH only
Answer: B
ISEs measure ion activity, not total ion content.
