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Questions and Answers
What is the main function of the cell membrane?
What is the main function of the cell membrane?
- To store genetic information
- To synthesize proteins for the cell
- To provide structural support to the cell
- To separate the intracellular fluid from the extracellular fluid (correct)
What is the composition of the cell membrane lipids?
What is the composition of the cell membrane lipids?
- Nucleic acids and phospholipids
- Mainly cholesterol with a small amount of phospholipids
- Mainly proteins and carbohydrates
- Lipid Bi-Layers with cholesterol molecules floating (correct)
What are the characteristics of the tails of phospholipids?
What are the characteristics of the tails of phospholipids?
- Are hydrophilic and contain phosphate
- Contain phosphate and are water soluble
- Contain fatty acids and are water insoluble (correct)
- Are hydrophobic and contain fatty acids
What is the main feature of facilitated diffusion?
What is the main feature of facilitated diffusion?
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What is the process that allows the cell to take in large molecules and particles?
What is the process that allows the cell to take in large molecules and particles?
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Study Notes
Cell Membrane
- The main function of the cell membrane is to regulate what enters and leaves the cell.
Composition of Cell Membrane Lipids
- The cell membrane is composed of phospholipids, which are amphipathic molecules with hydrophilic (water-loving) heads and hydrophobic (water-fearing) tails.
Characteristics of Phospholipid Tails
- The tails of phospholipids are non-polar and hydrophobic, allowing them to interact with each other and form a barrier to water and ions.
Facilitated Diffusion
- Facilitated diffusion is a type of passive transport that uses transport proteins to move molecules down their concentration gradient.
Cellular Uptake of Large Molecules and Particles
- Phagocytosis is the process that allows the cell to take in large molecules and particles by engulfing them with the cell membrane and forming a vesicle.
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