About This Chapter
Cell Membranes - Chapter Summary
High school and college students who are currently studying the basics of biology will need to make sure that they have a complete understanding of cell membranes if they wish to pass the course. If this describes you, use these helpful lessons to improve your knowledge of cell membranes and their relationship to the biology of cells.
Each lesson included in this chapter will provide comprehensive instruction on a key topic you will need to know in order to understand cell membranes as a whole. Once you are comfortable with your knowledge of these topics, you can take the chapter's practice quizzes and final exam to see what you remember from the lessons. If you are confused about a certain point, or would like further clarification, you can simply message the lesson instructors to ask for help. Your personal Dashboard can also be used to track your learning progress as you move through the chapter. Upon completing the lessons, you will be able to:
- Understand the hydrophobic and hydrophilic qualities of phospholipid layers
- Explain the fluid mosaic model of a cell membrane
- Understand passive transport in cells
- Define and provide examples of active transport in cells
- Define and explain endocytosis and exocytosis across cell membranes
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. 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.
4. 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!
5. 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.
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