- 1(current)
Q. No.The fluidity of plasma membrane in RBCs is primarily maintained by:
1. Cholesterol molecules
2. Phospholipids
3. Peripheral proteins
4. Glycoproteins
1. Cholesterol molecules
2. Phospholipids
3. Peripheral proteins
4. Glycoproteins
Subtopic: Cell Membrane |
Level 4: Below 35%
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The fluid mosaic model of plasma membrane was proposed by Singer and Nicolson in 1972.
1. True
2. False
1. True
2. False
Subtopic: Cell Membrane |
86%
Level 1: 80%+
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A student analyzes two biological macromolecules. Molecule X is found to be hydrophobic, insoluble in water, and a major component of plasma membranes. Molecule Y is hydrophilic, acts as a short-term energy carrier in cells, and its monomers are often lin
1, X: Phospholipid; Y: glycogen
2. X:Cholesterol; Y: Glucose
3. X:Triglyceride: Y: ATP
4. X:Phospholipid; Y:ATP
1, X: Phospholipid; Y: glycogen
2. X:Cholesterol; Y: Glucose
3. X:Triglyceride: Y: ATP
4. X:Phospholipid; Y:ATP
Subtopic: Cell Membrane |
Level 3: 35%-60%
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The fluid mosaic model of plasma membrane proposes that:
1. Proteins are embedded in a static lipid bilayer forming fixed structures
2. Lipids form a rigid bilayer with proteins attached only on the surface
3. Proteins float in a quasi-fluid lipid bilayer and have lateral mobility
4. Lipids and proteins form alternating layers creating a multi-laminar structure
1. Proteins are embedded in a static lipid bilayer forming fixed structures
2. Lipids form a rigid bilayer with proteins attached only on the surface
3. Proteins float in a quasi-fluid lipid bilayer and have lateral mobility
4. Lipids and proteins form alternating layers creating a multi-laminar structure
Subtopic: Cell Membrane |
90%
Level 1: 80%+
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Which of these correctly describes the asymmetry of the plasma membrane?
1. Lipid composition is identical on both leaflets but protein distribution differs
2. Protein composition is identical on both sides but lipid distribution differs
3. Both lipid and protein composition differ between the two leaflets
4. Both lipid and protein composition are identical creating a symmetric bilayer
1. Lipid composition is identical on both leaflets but protein distribution differs
2. Protein composition is identical on both sides but lipid distribution differs
3. Both lipid and protein composition differ between the two leaflets
4. Both lipid and protein composition are identical creating a symmetric bilayer
Subtopic: Cell Membrane |
Level 3: 35%-60%
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The plasma membrane is described by fluid mosaic model with:
| 1. | Lipid bilayer with integral proteins |
| 2. | Lipid monolayer with embedded proteins |
| 3. | Protein bilayer with embedded lipids |
| 4. | Carbohydrate layer with attached proteins |
Subtopic: Cell Membrane |
96%
Level 1: 80%+
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Osmosis is defined as:
| 1. | Movement of water through semipermeable membrane |
| 2. | Movement of solutes through membrane |
| 3. | Active transport requiring energy |
| 4. | Diffusion of gases across membrane |
Subtopic: Cell Membrane |
89%
Level 1: 80%+
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What would MOST LIKELY happen if the hydrophobic tails of phospholipids were forced to face outward towards the aqueous environment instead of inward as they normally do?
| 1. | The membrane would become more rigid and selectively permeable |
| 2. | The membrane structure would become unstable as the nonpolar tails would be exposed to the aqueous environment, disrupting the bilayer |
| 3. | The polar heads facing inward would strengthen the membrane by interacting with cytoplasmic water |
| 4. | Cholesterol would compensate and maintain membrane stability without any disruption |
Subtopic: Cell Membrane |
87%
Level 1: 80%+
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- 1(current)
Q. No.
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