CELL BIOLOGY EXAM QUESTIONS
Q1.
Explain how the fluid mosaic model has evolved over time. Critically evaluate modern evidence
that challenges or refines this model.
Q2.
Discuss the role of lipid asymmetry in the plasma membrane. How is this asymmetry established
and maintained, and what are the consequences of its disruption?
Q3.
Describe the structural and functional differences between rough and smooth endoplasmic
reticulum. How do these differences relate to cellular specialization?
Q4. (Essay)
Compare prokaryotic and eukaryotic cells at the molecular and functional level. Include
discussion on compartmentalization, genome organization, and metabolic efficiency.
Q5.
Explain the molecular mechanism of active transport using the Na⁺/K⁺ ATPase as a model.
Include conformational changes and energy coupling.
Q6.
Compare facilitated diffusion and secondary active transport. Provide examples and explain how
gradients are utilized.
Q7. (Essay)
Describe how G protein-coupled receptors (GPCRs) transduce signals. Discuss signal
amplification and mechanisms of desensitization.
Q8.
A mutation disrupts clathrin function. Predict and explain the cellular consequences on receptor-
mediated endocytosis.
Q9.
Compare microfilaments, intermediate filaments, and microtubules in terms of structure,
dynamics, and function.
Q10.
Explain how motor proteins (kinesin and dynein) convert chemical energy into mechanical work.
Include directionality and intracellular transport roles.
Q11. (Essay)
Discuss how the cytoskeleton contributes to cell polarity and migration. Include signaling
pathways and structural components.
Q12.
Describe the process of protein targeting to the endoplasmic reticulum, including the role of
signal peptides and SRP.
Q13.
Explain how proteins are sorted in the Golgi apparatus. What molecular signals determine their
final destination?
, Q14. (Essay)
Discuss the mechanisms of vesicular transport, including vesicle formation, targeting, docking,
and fusion.
Q15.
Outline the phases of the cell cycle and explain how checkpoints ensure genomic integrity.
Q16.
Explain the molecular roles of cyclins and cyclin-dependent kinases (CDKs) in cell cycle
regulation.
Q17. (Essay)
Describe the molecular mechanisms of mitosis, including spindle formation, chromosome
segregation, and cytokinesis.
Q18.
A drug inhibits microtubule polymerization. Predict its effects on mitosis and explain the underlying
mechanisms.
Q19.
Compare apoptosis and necrosis in terms of molecular pathways and physiological significance.
Q20. (Essay)
Discuss the role of mitochondria in apoptosis, including intrinsic pathways, cytochrome c release,
and caspase activation.
Q21.
Explain the concept of membrane microdomains (lipid rafts). What experimental approaches can
be used to study them, and what are the limitations of these methods?
Q22.
Discuss how cholesterol modulates membrane fluidity under varying temperature conditions.
Include its effect on phase transitions.
Q23. (Essay)
Analyze the role of the plasma membrane in cell–cell recognition and adhesion, including the
molecular basis of specificity.
Q24.
A researcher artificially increases phosphatidylserine exposure on the outer leaflet of the membrane.
Predict the cellular consequences and explain the underlying mechanisms.
Q25.
Describe the role of Rab GTPases in vesicular trafficking. How do they ensure specificity in
vesicle targeting?
Q26.
Explain how SNARE proteins mediate membrane fusion. What would be the effect of SNARE
dysfunction?
Q27. (Essay)
Discuss the coordination between the endoplasmic reticulum, Golgi apparatus, and lysosomes in
protein processing and degradation.
Q1.
Explain how the fluid mosaic model has evolved over time. Critically evaluate modern evidence
that challenges or refines this model.
Q2.
Discuss the role of lipid asymmetry in the plasma membrane. How is this asymmetry established
and maintained, and what are the consequences of its disruption?
Q3.
Describe the structural and functional differences between rough and smooth endoplasmic
reticulum. How do these differences relate to cellular specialization?
Q4. (Essay)
Compare prokaryotic and eukaryotic cells at the molecular and functional level. Include
discussion on compartmentalization, genome organization, and metabolic efficiency.
Q5.
Explain the molecular mechanism of active transport using the Na⁺/K⁺ ATPase as a model.
Include conformational changes and energy coupling.
Q6.
Compare facilitated diffusion and secondary active transport. Provide examples and explain how
gradients are utilized.
Q7. (Essay)
Describe how G protein-coupled receptors (GPCRs) transduce signals. Discuss signal
amplification and mechanisms of desensitization.
Q8.
A mutation disrupts clathrin function. Predict and explain the cellular consequences on receptor-
mediated endocytosis.
Q9.
Compare microfilaments, intermediate filaments, and microtubules in terms of structure,
dynamics, and function.
Q10.
Explain how motor proteins (kinesin and dynein) convert chemical energy into mechanical work.
Include directionality and intracellular transport roles.
Q11. (Essay)
Discuss how the cytoskeleton contributes to cell polarity and migration. Include signaling
pathways and structural components.
Q12.
Describe the process of protein targeting to the endoplasmic reticulum, including the role of
signal peptides and SRP.
Q13.
Explain how proteins are sorted in the Golgi apparatus. What molecular signals determine their
final destination?
, Q14. (Essay)
Discuss the mechanisms of vesicular transport, including vesicle formation, targeting, docking,
and fusion.
Q15.
Outline the phases of the cell cycle and explain how checkpoints ensure genomic integrity.
Q16.
Explain the molecular roles of cyclins and cyclin-dependent kinases (CDKs) in cell cycle
regulation.
Q17. (Essay)
Describe the molecular mechanisms of mitosis, including spindle formation, chromosome
segregation, and cytokinesis.
Q18.
A drug inhibits microtubule polymerization. Predict its effects on mitosis and explain the underlying
mechanisms.
Q19.
Compare apoptosis and necrosis in terms of molecular pathways and physiological significance.
Q20. (Essay)
Discuss the role of mitochondria in apoptosis, including intrinsic pathways, cytochrome c release,
and caspase activation.
Q21.
Explain the concept of membrane microdomains (lipid rafts). What experimental approaches can
be used to study them, and what are the limitations of these methods?
Q22.
Discuss how cholesterol modulates membrane fluidity under varying temperature conditions.
Include its effect on phase transitions.
Q23. (Essay)
Analyze the role of the plasma membrane in cell–cell recognition and adhesion, including the
molecular basis of specificity.
Q24.
A researcher artificially increases phosphatidylserine exposure on the outer leaflet of the membrane.
Predict the cellular consequences and explain the underlying mechanisms.
Q25.
Describe the role of Rab GTPases in vesicular trafficking. How do they ensure specificity in
vesicle targeting?
Q26.
Explain how SNARE proteins mediate membrane fusion. What would be the effect of SNARE
dysfunction?
Q27. (Essay)
Discuss the coordination between the endoplasmic reticulum, Golgi apparatus, and lysosomes in
protein processing and degradation.
