MCQ Collection
Medical Comprehensive Ability MCQs
Practice Medical Comprehensive Ability questions with answers and explanations.
Choose an option to check your answer.
A.
Antigen recognition plus appropriate co-stimulation and cytokine signals shape lymphocyte activation and differentiation
B.
Co-stimulation is irrelevant to immune tolerance
C.
Specific lymphocytes activate without any signal
D.
Cytokines cannot influence cell differentiation
Show Answer
Correct Answer: A. Antigen recognition plus appropriate co-stimulation and cytokine signals shape lymphocyte activation and differentiation
Explanation:
Adaptive responses integrate receptor specificity with co-stimulatory and environmental signals.
Choose an option to check your answer.
A.
Compensation changes the other component of the bicarbonate-carbon dioxide system but does not remove the primary disorder
B.
The lungs regulate bicarbonate directly as their main action
C.
Compensation always overshoots to the opposite pH disorder
D.
The kidneys cannot affect acid-base balance
Show Answer
Correct Answer: A. Compensation changes the other component of the bicarbonate-carbon dioxide system but does not remove the primary disorder
Explanation:
Respiratory and renal responses limit pH change while the primary process remains identifiable.
Choose an option to check your answer.
A.
All mediators have identical effects
B.
Inflammation occurs without signalling molecules
C.
Inflammatory mediators coordinate vascular change, leukocyte recruitment and local symptoms
D.
Acute inflammation never recruits leukocytes
Show Answer
Correct Answer: C. Inflammatory mediators coordinate vascular change, leukocyte recruitment and local symptoms
Explanation:
Multiple mediators act on vessels, cells and tissues to produce the organised inflammatory response.
Choose an option to check your answer.
A.
A single mutation always produces invasive cancer immediately
B.
DNA repair has no relevance to cancer risk
C.
Cancer develops through accumulated alterations affecting growth control, survival, repair and the tissue environment
D.
Tumours are unrelated to selection among cell clones
Show Answer
Correct Answer: C. Cancer develops through accumulated alterations affecting growth control, survival, repair and the tissue environment
Explanation:
Tumorigenesis is multistep and reflects genetic, epigenetic and microenvironmental selection.
Choose an option to check your answer.
A.
Clearance is the same as absorption fraction
B.
Clearance relates elimination rate to drug concentration and helps determine maintenance dosing
C.
Maintenance dosing depends only on tablet colour
D.
Clearance has no relationship to elimination
Show Answer
Correct Answer: B. Clearance relates elimination rate to drug concentration and helps determine maintenance dosing
Explanation:
Systemic clearance describes the effective volume cleared per unit time and links concentration to elimination rate.
Choose an option to check your answer.
A.
An irreversible antagonist permanently occupies receptors, so increasing agonist concentration fully restores the original maximal response
B.
A reversible competitive antagonist necessarily lowers the maximal response even when much higher agonist concentrations are available
C.
A reversible competitive antagonist shifts an agonist concentration-response curve to the right without reducing maximal response when enough agonist is available
D.
A competitive antagonist increases agonist potency by shifting the concentration-response curve left while leaving receptor occupancy unchanged
Show Answer
Correct Answer: C. A reversible competitive antagonist shifts an agonist concentration-response curve to the right without reducing maximal response when enough agonist is available
Explanation:
Competition at the same receptor can be overcome by higher agonist concentration, reducing apparent potency but not efficacy.
Choose an option to check your answer.
A.
Stopping all infection control prevents resistance
B.
Resistance has no genetic basis
C.
Antibiotics deliberately teach each bacterium to resist
D.
Antibiotic exposure can select resistant organisms already carrying or acquiring resistance determinants
Show Answer
Correct Answer: D. Antibiotic exposure can select resistant organisms already carrying or acquiring resistance determinants
Explanation:
Selection favours resistant variants, while transmission and gene exchange can spread resistance.
Choose an option to check your answer.
A.
Co-stimulation is irrelevant to immune tolerance
B.
Cytokines cannot influence cell differentiation
C.
Antigen recognition plus appropriate co-stimulation and cytokine signals shape lymphocyte activation and differentiation
D.
Specific lymphocytes activate without any signal
Show Answer
Correct Answer: C. Antigen recognition plus appropriate co-stimulation and cytokine signals shape lymphocyte activation and differentiation
Explanation:
Adaptive responses integrate receptor specificity with co-stimulatory and environmental signals.
Choose an option to check your answer.
A.
Measurement methods cannot introduce systematic error
B.
Random error and bias are identical
C.
Bias is a systematic error in selection, measurement or analysis that can distort an estimated association
D.
Bias is eliminated automatically by a large sample
Show Answer
Correct Answer: C. Bias is a systematic error in selection, measurement or analysis that can distort an estimated association
Explanation:
Larger samples reduce random error but do not necessarily correct systematic design or measurement problems.
Choose an option to check your answer.
A.
Net passive transport follows an electrochemical gradient and does not directly consume ATP
B.
Transport proteins cannot be selective
C.
Diffusion moves every solute against its gradient
D.
All membrane transport directly hydrolyses ATP
Show Answer
Correct Answer: A. Net passive transport follows an electrochemical gradient and does not directly consume ATP
Explanation:
Passive transport is driven by concentration and electrical gradients, although channels or carriers may facilitate it.
Choose an option to check your answer.
A.
Clearance has no relationship to elimination
B.
Clearance relates elimination rate to drug concentration and helps determine maintenance dosing
C.
Clearance is the same as absorption fraction
D.
Maintenance dosing depends only on tablet colour
Show Answer
Correct Answer: B. Clearance relates elimination rate to drug concentration and helps determine maintenance dosing
Explanation:
Systemic clearance describes the effective volume cleared per unit time and links concentration to elimination rate.
Choose an option to check your answer.
A.
A reversible competitive antagonist shifts an agonist concentration-response curve to the right without reducing maximal response when enough agonist is available
B.
A reversible competitive antagonist necessarily lowers the maximal response even when much higher agonist concentrations are available
C.
An irreversible antagonist permanently occupies receptors, so increasing agonist concentration fully restores the original maximal response
D.
A competitive antagonist increases agonist potency by shifting the concentration-response curve left while leaving receptor occupancy unchanged
Show Answer
Correct Answer: A. A reversible competitive antagonist shifts an agonist concentration-response curve to the right without reducing maximal response when enough agonist is available
Explanation:
Competition at the same receptor can be overcome by higher agonist concentration, reducing apparent potency but not efficacy.
