Q. No.A plasma membrane is characteristic of
| 1. | all cells |
| 2. | prokaryotic cells only |
| 3. | eukaryotic cells only |
| 4. | animal cells only |
Subtopic: Â Introduction to Cell |Â Cell Membrane |
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Which one of the following is an amphipathic molecule that forms the basis of biological membranes by aligning its hydrophobic and hydrophilic regions?
| 1. | Triglyceride | 2. | Phospholipid |
| 3. | Steroid hormone | 4. | Terpene |
Subtopic: Â Cell Membrane |
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Integral and peripheral proteins differ in their placement in the membrane. Why can integral proteins not be easily extracted from the membrane?
| 1. | They are partially or completely embedded in the membrane. |
| 2. | They are loosely attached to the lipid bilayer. |
| 3. | They form ionic bonds with membrane lipids. |
| 4. | They are attached only to carbohydrate chains. |
Subtopic: Â Cell Membrane |
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The detailed structure of the cell membrane was studied only after the advent of the:
1. compound microscope
2. cryo-electron microscopy
3. X-ray crystallography
4. electron microscope
Subtopic: Â Cell Membrane |
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Which of the following describes passive transport across the plasma membrane?
| 1. | It requires ATP for movement of molecules against the concentration gradient. |
| 2. | It involves the movement of molecules along the concentration gradient without energy expenditure. |
| 3. | It uses carrier proteins to actively transport ions across the bilayer. |
| 4. | It relies on vesicles to transport large macromolecules into the cell. |
Subtopic: Â Cell Membrane |
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The fluid mosaic model of plasma membrane proposes that:
| 1. | Proteins form a continuous rigid layer around lipid molecules |
| 2. | Lipids are embedded within a protein matrix forming a static structure |
| 3. | Both proteins and lipids are immobile within the membrane |
| 4. | Proteins are dispersed in a phospholipid bilayer and show lateral movement |
Subtopic: Â Cell Membrane |Â Evidence for Fluidic Nature of Membrane |
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Select the correct statement from the following regarding cell membrane:
| 1. | Na+ and K+ ions move across cell membranes by passive transport |
| 2. | Proteins make up 60% to 70% of the cell membrane |
| 3. | Lipids are arranged in a bilayer with polar heads towards the inner part |
| 4. | Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson |
Subtopic: Â Cell Membrane |
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AIPMT - 2012
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Which of the following best describes the composition of the cell membrane in human red blood cells (RBCs)?
| 1. | 60% proteins and 40% lipids |
| 2. | 40% proteins and 60% lipids |
| 3. | 52% proteins and 40% lipids |
| 4. | 40% proteins and 52% lipids |
Subtopic: Â Cell Membrane |
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In which of the following processes the movement of substance takes place along the concentration gradient
1. Diffusion
2. Osmosis
3. Active transport
4. Both A and B
Subtopic: Â Cell Membrane |
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Select the incorrect match from the following
| 1. | Tails of lipids in plasma membrane | - | Hydrophobic |
| 2. | Membrane of human RBC | - | Approximately 52% proteins |
| 3. | Integral proteins in plasma membrane | - | Partially or totally buried |
| 4. | Plasma membrane in animal cells | - | Does not have cholesterol |
Subtopic: Â Cell Membrane |
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