Cell wall, plasma membrane and the fluid mosaic model — practice questions
5 questions in the bank on this idea. Below are 5 of them, exactly as they appear in a test.
Which molecules form the basic bilayer of the plasma membrane?
- A. Phospholipids
- B. Cellulose
- C. Peptidoglycan
- D. Chitin
Why is the plasma membrane described as selectively permeable?
- A. It allows every substance to cross freely
- B. It regulates which substances enter and leave the cell
- C. It prevents all movement across the membrane
- D. It is made entirely of proteins
Red blood cells swell when placed in distilled water. Which process best explains the net movement of water into the cells?
- A. Osmosis
- B. Active transport
- C. Endocytosis
- D. Exocytosis
A membrane protein moves laterally within the plane of the lipid bilayer rather than remaining fixed in one position. Which model of membrane structure does this observation support?
- A. Fluid mosaic model
- B. Unit membrane model with completely fixed proteins
- C. Cell wall model
- D. Micellar model
A cell is placed in a solution with a higher concentration of non-penetrating solute than the cell interior. What is the most likely immediate water movement?
- A. Net water movement into the cell
- B. Net water movement out of the cell
- C. No water movement at all
- D. Water movement only by active transport
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