Section A: Multiple Choice Questions (MCQs)
Q1. Which of the following best describes the fluid mosaic model of the plasma membrane?
A. A rigid bilayer of lipids with embedded proteins
B. A dynamic lipid bilayer with proteins that move laterally
C. A protein layer surrounding a lipid core
D. A carbohydrate bilayer with embedded lipids
Q2. Which organelle is primarily responsible for lipid synthesis?
A. Rough endoplasmic reticulum
B. Smooth endoplasmic reticulum
C. Golgi apparatus
D. Lysosome
Q3. Which of the following proteins is involved in vesicle fusion with target membranes?
A. Clathrin
B. SNARE
C. Tubulin
D. Dynein
Q4. The Na⁺/K⁺ ATPase pump moves:
A. 2 Na⁺ out, 3 K⁺ in
B. 3 Na⁺ out, 2 K⁺ in
C. 3 Na⁺ in, 2 K⁺ out
D. 2 Na⁺ in, 3 K⁺ out
Q5. Which cytoskeletal element is most important for cell motility?
A. Microtubules
B. Intermediate filaments
C. Actin filaments
D. Collagen fibers
Q6. Which phase of the cell cycle includes DNA replication?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Q7. Which molecule regulates progression through the cell cycle?
A. Ribosomes
B. Cyclins
Q1. Which of the following best describes the fluid mosaic model of the plasma membrane?
A. A rigid bilayer of lipids with embedded proteins
B. A dynamic lipid bilayer with proteins that move laterally
C. A protein layer surrounding a lipid core
D. A carbohydrate bilayer with embedded lipids
Q2. Which organelle is primarily responsible for lipid synthesis?
A. Rough endoplasmic reticulum
B. Smooth endoplasmic reticulum
C. Golgi apparatus
D. Lysosome
Q3. Which of the following proteins is involved in vesicle fusion with target membranes?
A. Clathrin
B. SNARE
C. Tubulin
D. Dynein
Q4. The Na⁺/K⁺ ATPase pump moves:
A. 2 Na⁺ out, 3 K⁺ in
B. 3 Na⁺ out, 2 K⁺ in
C. 3 Na⁺ in, 2 K⁺ out
D. 2 Na⁺ in, 3 K⁺ out
Q5. Which cytoskeletal element is most important for cell motility?
A. Microtubules
B. Intermediate filaments
C. Actin filaments
D. Collagen fibers
Q6. Which phase of the cell cycle includes DNA replication?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Q7. Which molecule regulates progression through the cell cycle?
A. Ribosomes
B. Cyclins
