NEET-UG Biology · Class 11
Cell wall, plasma membrane and the fluid mosaic model — NEET & JEE Questions
Cell wall, plasma membrane and the fluid mosaic model is a topic in Cell: The Unit of Life, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Cell wall, plasma membrane and the fluid mosaic model, each with the marking scheme of the real paper.
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Cell wall, plasma membrane and the fluid mosaic model MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
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
The plant cell wall is located
- A. outside the plasma membrane
- B. inside the nucleus
- C. between chromosomes
- D. inside the mitochondrial matrix
The fluid mosaic model describes the plasma membrane as
- A. a fluid phospholipid bilayer with proteins embedded or associated within it
- B. a rigid cellulose sheet
- C. a protein-only wall with no lipids
- D. a static trilaminar structure with immobile components
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 small nonpolar molecule crosses a cell membrane directly through the lipid bilayer without a transport protein. This is
- A. simple diffusion
- B. active transport
- C. endocytosis
- D. osmosis of solute
A membrane protein moves ions against their concentration gradient using ATP. This is an example of
- A. active transport
- B. simple diffusion
- C. facilitated diffusion only
- D. osmosis
Why are phospholipids suitable for forming cell membranes in water?
- A. They are amphipathic, with hydrophilic heads and hydrophobic tails
- B. They are entirely hydrophilic
- C. They are entirely hydrophobic
- D. They are covalently linked into a cellulose wall
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 plant cell is placed in a hypotonic solution. Why does its cell wall help prevent bursting?
- A. The wall resists expansion as water enters and turgor pressure rises
- B. The wall actively pumps all water out
- C. The wall prevents any water from crossing the membrane
- D. The wall digests excess water
Common mistakes in Cell wall, plasma membrane and the fluid mosaic model
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Assuming water always moves into cells whenever solute is present.
- Interprets the mosaic model as a rigid arrangement of fixed proteins.
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