Cell Membrane Midterm Questions (PDF)

# هام جدا الفكرة من الأسئلة هو تثبيت المعلومة وليس قياس للمستوى وبإذن الله سيتم تجهيز أسئلة عبارة عن midterm - MCQS - Complete Writing - Matching - المواكبة نظام الامتحان بالتوفيق By mahgoub # Questions 1. The cell membrane is primarily composed of: - a) Proteins - b) Lipids - c)...

# هام جدا الفكرة من الأسئلة هو تثبيت المعلومة وليس قياس للمستوى وبإذن الله سيتم تجهيز أسئلة عبارة عن midterm - MCQS - Complete Writing - Matching - المواكبة نظام الامتحان بالتوفيق By mahgoub # Questions 1. The cell membrane is primarily composed of: - a) Proteins - b) Lipids - c) Carbohydrates - d) All of the above 2. The basic structure of the cell membrane is the: - a) Phospholipid bilayer - b) Glycoprotein layer - c) Transmembrane protein - d) Cholesterol layer 3. The phospholipid molecules in the cell membrane are arranged in a: - a) Monolayer - b) Bilayer - c) Triplelayer - d) Quadrilayer 4. The hydrophilic heads of the phospholipids are oriented: - a) Towards the interior of the membrane - b) Towards the exterior of the membrane - c) Randomly within the membrane - d) Both towards the interior and exterior of the membrane 5. The hydrophobic tails of the phospholipids are oriented: - a) Towards the interior of the membrane - b) Towards the exterior of the membrane - c) Randomly within the membrane - d) Both towards the interior and exterior of the membrane 6. The fuzzy appearance of the cell membrane observed under an electron microscope is due to: - a) Phospholipids - b) Glycoproteins - c) Cholesterol - d) Transmembrane proteins 7. Which of the following is a function of the cell membrane? - a) Facilitating transport of substances - b) Providing structural support - c) Participating in cell-cell communication - d) All of the above 8. The process of transporting large molecules or particles into the cell is called: - a) Diffusion - b) Osmosis - c) Endocytosis - d) Exocytosis 9. The process of transporting substances out of the cell is called: - a) Diffusion - b) Osmosis - c) Endocytosis - d) Exocytosis 10. Transmembrane proteins that act as channels for the passage of ions and water-soluble substances are called: - a) Receptors - b) Pumps - c) Transporters - d) Ion channels 11. Transmembrane proteins that use energy to actively transport substances across the cell membrane are called: - a) Receptors - b) Pumps - c) Transporters - d) Ion channels 12. Transmembrane proteins that bind to specific molecules and trigger a response within the cell are called: - a) Receptors - b) Pumps - c) Transporters - d) Ion channels 13. The cell coat or glycocalyx is composed of: - a) Glycolipids - b) Glycoproteins - c) Both glycolipids and glycoproteins - d) Phospholipids 14. The function of the cell coat or glycocalyx includes: - a) Cell-cell recognition and adhesion - b) Enzyme activity - c) Protecting the cell from injury - d) All of the above 15. Defects in the cell coat enzymes can lead to: - a) Malabsorption syndrome - b) Dwarfism - c) Type II diabetes - d) Lactose intolerance 16. The trilaminar appearance of the cell membrane under an electron microscope is due to: - a) Deposition of osmium tetroxide - b) Arrangement of phospholipids - c) Presence of transmembrane proteins - d) Glycoprotein layer 17. Cholesterol in the cell membrane: - a) Increases fluidity - b) Decreases fluidity - c) Has no effect on fluidity - d) Depends on the type of phospholipids 18. The process of taking in solid particles by the cell membrane is called: - a) Pinocytosis - b) Phagocytosis - c) Receptor-mediated endocytosis - d) Exocytosis 19. The process of taking in fluid particles by the cell membrane is called: - a) Pinocytosis - b) Phagocytosis - c) Receptor-mediated endocytosis - d) Exocytosis 20. The process of transporting specific molecules into the cell through receptor-mediated endocytosis is called: - a) Pinocytosis - b) Phagocytosis - c) Receptor-mediated endocytosis - d) Exocytosis 21. Dwarfism can be caused by: - a) Defective growth hormone receptors - b) Defective insulin receptors - c) Defective cell coat enzymes - d) Defective phospholipids 22. Type II diabetes can be caused by: - a) Defective growth hormone receptors - b) Defective insulin receptors - c) Defective cell coat enzymes - d) Defective phospholipids 23. Lactose intolerance can be caused by: - a) Defective growth hormone receptors - b) Defective insulin receptors - c) Defective cell coat enzymes - d) Defective phospholipids 24. The cell membrane is essential for: - a) Cell signaling - b) Cell metabolism - c) Cell transport - d) All of the above 25. The cell membrane is involved in: - a) Endocytosis - b) Exocytosis - c) Membrane trafficking - d) All of the above 26. The cell membrane is composed of: - a) 30% lipids, 70% proteins - b) 50% lipids, 50% proteins - c) 70% lipids, 30% proteins - d) 20% lipids, 80% proteins 27. The hydrophobic nature of the cell membrane is due to: - a) Phospholipids - b) Glycoproteins - c) Cholesterol - d) Transmembrane proteins 28. The fuzzy appearance of the cell membrane observed under an electron microscope is due to the presence of: - a) Phospholipids - b) Glycoproteins - c) Cholesterol - d) Transmembrane proteins 29. The process of taking in fluid particles by the cell membrane is called: - a) Pinocytosis - b) Phagocytosis - c) Receptor-mediated endocytosis - d) Exocytosis 30. The process of transporting specific molecules out of the cell is called. - a) Pinocytosis - b) Phagocytosis - c) Receptor-mediated endocytosis - d) Exocytosis # Answers 1. d) All of the above 2. a) Phospholipid bilayer 3. b) Bilayer 4. d) Both towards the interior and exterior of the membrane 5. a) Towards the interior of the membrane 6. b) Glycoproteins 7. d) All of the above 8. c) Endocytosis 9. d) Exocytosis 10. d) Ion channels 11. b) Pumps 12. a) Receptors 13. c) Both glycolipids and glycoproteins 14. d) All of the above 15. d) Lactose intolerance 16. a) Deposition of osmium tetroxide 17. b) Decreases fluidity 18. b) Phagocytosis 19. a) Pinocytosis 20. c) Receptor-mediated endocytosis 21. a) Defective growth hormone receptors 22. b) Defective insulin receptors 23. c) Defective cell coat enzymes 24. d) All of the above 25. d) All of the above 26. b) 50% lipids, 50% proteins 27. a) Phospholipids 28. b) Glycoproteins 29. a) Pinocytosis 30. d) Exocytosis