About This Chapter
Cell Membrane & Transport Overview - Chapter Summary
This collection of short video lessons examines concepts surrounding the cell membrane and transport in cells. Work through the chapter at your own pace to study the phospholipid bilayer, the fluid mosaic model, facilitated diffusion, endocytosis/exocytosis, osmosis and passive/active transport. Following each lesson is a short quiz to help you remember key biology terms. Take the chapter exam to master the material, and feel free to reach out to our subject matter experts if you have any questions about these topics. By the end of the chapter, you should be able to:
- Recognize the hydrophobic and hydrophilic nature of the phospholipid bilayer
- Describe the cell membrane's fluid mosaic model
- Explain the process of endocytosis and exocytosis in the cell membrane
- Evaluate active and passive transport in cells
1. How a Phospholipid Bilayer Is Both Hydrophobic and Hydrophilic
In this lesson, we will learn what gives phospholipids a dual personality. How can this molecule be both hydrophobic and hydrophilic, and why is this important to a cell?
2. The Fluid Mosaic Model of the Cell Membrane
In this lesson, we will discuss the components of the cell membrane and why the fluid mosaic model paints the best picture of its structure. We'll learn about the roles of the phospholipid bilayer, cholesterol, proteins and carbohydrates.
3. Endocytosis and Exocytosis Across the Cell Membrane
In this lesson, we'll discover how some cells can eat, drink, and digest their dinner through the process of endocytosis and a structure called the lysosome. In addition, we'll learn how a cell can throw out the leftovers across the cell membrane during exocytosis.
4. Passive Transport in Cells: Simple and Facilitated Diffusion & Osmosis
A cell membrane is selectively permeable - not permeable to everything. In this lesson, we'll talk about methods of passive transport along a concentration gradient, including simple and facilitated diffusion and osmosis.
5. Active Transport in Cells: Definition & Examples
In this lesson, we'll learn how substances are transported across the cell membrane against the concentration gradient. This might seem like an uphill battle for the cell, but all it takes is a little chemical energy and a few integral membrane proteins to kick off some active transport!
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Other chapters within the Biology 203: Cell & Molecular Biology course
- Biological Molecules
- Cell Structure & Function Overview
- Principles of Cell Metabolism
- Photosynthesis Fundamentals
- Cellular Respiration & Fermentation
- Cell Cycles
- Patterns of Genetic Inheritance
- DNA Structure & Replication
- Mutation & DNA Damage
- The Central Dogma of Biology & Protein Synthesis
- Structure & Function of Viruses
- Control of Gene Expression
- Genetic Manipulation Overview