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Questions and Answers
Which structure separates cells from the external world?
Which structure separates cells from the external world?
- Endoplasmic reticulum
- Mitochondria
- Nucleus
- Plasma membrane (correct)
Which model best describes the structure of the lipid bilayer?
Which model best describes the structure of the lipid bilayer?
- Solid monolayer model
- Fluid mosaic model (correct)
- Solid mosaic model
- Fluid monolayer model
What is the composition of the plasma membrane?
What is the composition of the plasma membrane?
- Protein bilayer with polar ends facing inwards
- Protein bilayer with non-polar ends facing outwards
- Lipid bilayer with polar ends facing outwards
- Lipid bilayer with non-polar ends facing inwards (correct)
Which type of ends of the lipid bilayer are facing inwards?
Which type of ends of the lipid bilayer are facing inwards?
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How are cellular membranes presented in the fluid-mosaic model?
How are cellular membranes presented in the fluid-mosaic model?
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Which model presents cellular membranes as dynamic structures with mobile components?
Which model presents cellular membranes as dynamic structures with mobile components?
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What is the width of the plasma membrane?
What is the width of the plasma membrane?
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What is the composition of the plasma membrane?
What is the composition of the plasma membrane?
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Study Notes
Cell Membrane Structure
- The plasma membrane acts as a barrier, separating cells from the external environment.
- The fluid-mosaic model is the best representation of the lipid bilayer structure.
Composition of the Plasma Membrane
- Composed mainly of phospholipids, proteins, carbohydrates, and cholesterol.
- Phospholipids form the bilayer, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails oriented inwards.
Orientation of Lipid Bilayer
- The hydrophobic tails of the lipid bilayer are facing inwards, creating a protective inner environment for cellular components.
Fluid-Mosaic Model
- Cellular membranes are described as dynamic structures with mobile components, allowing for flexibility and functionality.
- Proteins float in or on the fluid lipid bilayer, resembling a mosaic pattern.
Physical Characteristics
- The typical width of the plasma membrane is approximately 7.5 to 10 nanometers.
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