About This Chapter
How it works:
- Identify which concepts are covered on your cell biology homework.
- Find videos on those topics within this chapter.
- Watch fun videos, pausing and reviewing as needed.
- Complete sample questions and get instant feedback.
- Finish your cell biology homework with ease!
Topics from your homework you'll be able to complete:
- Fluid mosaic model of the cell membrane
- Passive and active transport in cells
- Structure of the nucleus
- Mitochondria structure
- Chloroplast structure
- Plant cell structures
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.
6. Structure of the Nucleus: Nucleolus, Nuclear Membrane, and Nuclear Pores
In this lesson, we'll discuss the organization and importance of the nucleus in your cells. This is the membrane-bound structure responsible for containing all the genetic material essential to making you who you are.
7. The Ribosome: Structure, Function and Location
The ribosome is the cellular structure responsible for decoding your DNA. In this lesson, we'll learn about ribosome structure, function and location - characteristics that make it a very good genetic translator.
8. The Endomembrane System: Functions & Components
In this lesson, we'll learn about the endomembrane system, which consists of the endoplasmic reticulum and the Golgi apparatus. This system is important in making, packaging, and shipping all sorts of goodies for the cell to use!
9. The Cytoskeleton: Microtubules and Microfilaments
In this lesson, we'll learn about the cytoskeleton of your cells. This network of microtubules, intermediate filaments, and microfilaments helps different types of cells maintain a unique set of characteristics, including shape and movement.
10. Mitochondria Structure: Cristae, Matrix and Inner & Outer Membrane
If you want to make it through the day, you're going to need some energy. In this lesson, we'll learn about the organelle that supplies this energy, the mitochondrion, and why this cell structure appreciates the time you took to eat breakfast this morning!
11. Chloroplast Structure: Chlorophyll, Stroma, Thylakoid, and Grana
In this lesson, we'll explore the parts of the chloroplast, such as the thylakoids and stroma, that make a chloroplast the perfect place for conducting photosynthesis in plant cells.
12. Plant Cell Structures: The Cell Wall and Central Vacuole
In this lesson, we'll talk about some of the things that make plant cells so different from our cells. In addition to being mean, green photosynthesizing machines, plant cells have cell walls and central vacuoles to make them unique!
13. Eukaryotic and Prokaryotic Cells: Similarities and Differences
In this lesson, we discuss the similarities and differences between the eukaryotic cells of your body and prokaryotic cells such as bacteria. Eukaryotes organize different functions within specialized membrane-bound compartments called organelles. These structures do not exist in prokaryotes.
14. Selectively Permeable Membranes: Definition & Examples
Our bodies are composed of billions of cells. There has to be a way to regulate what enters and leaves these cells. In this lesson, we will examine selectively permeable membranes and their critical role in the function of a cell.
15. Membrane-Bound Organelles in Eukaryotic Cells
Eukaryotic cells have several types of organelles working inside them. In this lesson, we will examine the various types of membrane-bound organelles and their functions.
16. Membrane Proteins: Functions, Types & Structure
All membrane proteins have one thing in common, which is that they are all associated with a membrane. As a group, however, they are structurally and functionally highly diverse. In this lesson, we will explore the different types of membrane proteins, how they function, and their structure.
17. Smooth ER: Definition, Functions & Structure
The smooth endoplasmic reticulum is like a little factory inside the cells of animals and plants. Read more about this fascinating structure and how it makes and distributes the products that cells need to function correctly.
18. Eosinophils: Definition & Function
In this lesson, you'll learn about the structure and function of eosinophils, including where they are made and used in the body, their function(s) in the immune response, and how too many or too few of these cells can affect bodily function.
19. Inner Cell Mass (ICM): Definition & Function
The inner cell mass (ICM) is small, but these few cells are destined for greatness. Learn about the formation of this developmental milestone that comes after fertilization.
20. Mitochondrial Cristae: Definition & Function
The mitochondrial inner membrane carries out the electron transport chain, an important step in releasing energy from simple food molecules within the cell. Learn about the membrane structures called cristae and how they enhance the membrane's ability to function.
21. Mitochondrial Inner Membrane: Definition & Overview
The inner membrane of the mitochondrion is involved in the final step in aerobic respiration. Discover the intricacies of this membrane and how it is the key to unlocking the full energy potential of food.
22. Mitochondrial Matrix: Definition & Function
The mitochondrion is one of the most important organelles in eukaryotic cells. Inside the double membranes of the mitochondrion is a matrix. Discover the nature of the mitochondrial matrix and the processes that occur there.
23. Mitochondrial Outer Membrane: Definition & Overview
The mitochondrion is an organelle found in our cells that is sometimes referred to as a 'cellular power plant.' Each mitochondrion is enclosed in a membrane. Learn the structure and function of this membrane.
24. Myosin: Definition, Function & Structure
There are many different fibers and filaments that help cells and organisms move, walk, talk, breathe, etc. One of these filaments is called myosin. Watch the video lesson to find out what myosin is, how it works and its structure.
25. Pinocytosis: Definition & Examples
Cells function in similar fashions to the organisms that they make up. They need to breathe, eat, drink, produce waste, etc. Cells have adapted ways in which to do these seemingly menial tasks, one of which, pinocytosis, we look at here.
26. Tropomyosin: Definition, Structure & Function
Tropomyosin is an important player in muscle contraction. In this lesson, you will learn how it works together with other proteins to regulate skeletal muscle contraction.
27. What are Cells? - Overview
All living organisms are made up of cells, but do you know what a cell is? In this lesson, you can learn about the three main structures that all cells contain and about the two major types of cells.
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