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Questions and Answers
What is the primary structural component of the cell membrane?
What property of phospholipids allows them to form a bilayer in the cell membrane?
What role does cholesterol play in the cell membrane?
Which of the following statements about glycolipids is true?
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What distinguishes active transport from passive transport?
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Which transport mechanism allows for the movement of water across the cell membrane?
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Which mechanism involves the internalization of larger particles or droplets by the cell?
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In a passive transport scenario, which direction would glucose typically move if it is more concentrated inside a cell?
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Study Notes
Cell Membrane Structure
- Cell membranes are composed primarily of phospholipids, forming a bilayer structure.
- The polar head of a phospholipid interacts with water molecules (hydrophilic), while the nonpolar fatty acid tails repel water (hydrophobic).
- This arrangement creates a barrier between the cell's interior (cytosol) and the external environment.
- Cholesterol is another important lipid component of animal cell membranes.
- Cholesterol helps maintain membrane fluidity by preventing phospholipids from packing too tightly.
- Glycolipids, located on the cell membrane surface, have a carbohydrate sugar chain.
- Glycolipids are involved in cell recognition.
Transport Mechanisms
- Passive transport: movement of substances across the membrane without requiring energy.
- This is driven by concentration gradients or pressure differences.
- Diffusion: movement of molecules from a region of higher concentration to lower concentration.
- Osmosis: the movement of water molecules across a semi-permeable membrane from an area of high water concentration to an area of low water concentration.
- Facilitated transport: the movement of molecules across a membrane with the help of transport proteins.
- Active transport: movement of molecules against their concentration gradient, requiring energy.
Self-Assessment Question 1
- The cell described has a higher concentration of glucose inside than outside.
- This means glucose will move passively out of the cell due to diffusion, following the concentration gradient from high to low.
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Description
Explore the essential components and functions of cell membranes, including phospholipids, cholesterol, and glycolipids. Understand the various transport mechanisms, such as passive transport, diffusion, and osmosis, that regulate the movement of substances across the membrane.
