Cell Membrane Structure & Transport MCQ Quiz | Cell Biology

1. The Fluid Mosaic Model of the cell membrane was proposed by:

2. Which component of the cell membrane acts as a “fluidity buffer,” preventing the membrane from becoming too fluid at high temperatures or too rigid at low temperatures?

3. The asymmetric distribution of which molecules on the outer leaflet of the plasma membrane is primarily responsible for forming the glycocalyx?

4. Which of the following transport processes exhibits saturation kinetics, similar to enzyme kinetics?

5. The Na+/K+ ATPase pump is a classic example of primary active transport. What is the correct stoichiometry of its action?

6. The SGLT1 transporter in the intestinal epithelium couples the uptake of glucose into the cell with the transport of Na+ down its concentration gradient. This is an example of:

7. Cystic fibrosis is caused by a mutation in the CFTR gene, which codes for a protein that functions as a:

8. The process by which a cell engulfs large solid particles, such as bacteria or cellular debris, is known as:

9. Lipid rafts are specialized microdomains within the cell membrane. They are enriched in which of the following components?

10. The protein responsible for coating vesicles during receptor-mediated endocytosis of LDL particles is:

11. Which molecule is most likely to pass through a cell membrane by simple diffusion?

12. The structural integrity and biconcave shape of an erythrocyte (red blood cell) membrane are primarily maintained by which cytoskeletal protein?

13. Placing a red blood cell in a hypertonic solution will cause it to:

14. Transmembrane proteins that span the lipid bilayer multiple times are often characterized by what secondary structure in their membrane-spanning regions?

15. The fusion of a secretory vesicle with the plasma membrane to release its contents to the extracellular space requires the interaction of:

16. The rapid movement of water across cell membranes, faster than can be accounted for by simple diffusion, is facilitated by:

17. Which of the following statements about peripheral membrane proteins is TRUE?

18. The Band 3 protein in erythrocytes is an anion exchanger that facilitates the “chloride shift”. This is an example of:

19. An increase in the proportion of unsaturated fatty acid tails in the phospholipids of a membrane will:

20. Which term describes the property of phospholipids having a hydrophilic head and a hydrophobic tail?

21. The GLUT family of transporters moves glucose across the cell membrane via:

22. Which of the following is a key characteristic of active transport?

23. G-protein coupled receptors (GPCRs) are a large family of integral membrane proteins characterized by:

24. The Na+/Ca2+ exchanger in cardiac muscle cells is a crucial transporter that moves 3 Na+ ions into the cell for every 1 Ca2+ ion moved out. This is an example of:

25. “Cell drinking,” the non-specific uptake of extracellular fluid and solutes into small vesicles, is known as: