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Ch 15: Praxis Biology & General Science: Cell Structures and Functions

About This Chapter

Use our video lessons to learn about the structure and functions of cells. Get info on the different types of cells, the cell membrane, the nucleus of a cell and much more to help you prepare for the Praxis II Biology and General Science exam.

Praxis Biology & General Science: Cell Structures and Functions - Chapter Summary

Prepare for the Praxis II Biology and General Science test with these video lessons on cell structure and functions. Find out about eukaryotic and prokaryotic cells, learn how plant cells differ from human cells and examine the structure and function of bacterial cell walls. This chapter will introduce you to active transport in cells, the three types of endocytosis, the exocytosis process, the components of the endomembrane system and osmolarity. After you complete this chapter you'll be familiar with:

  • Arrangement and importance of the phospholipid bilayer
  • Fluid mosaic model
  • Cell wall and central vacuole in a plant cell
  • Passive and active transport methods
  • Structure of the nucleus
  • Function and location of the ribosome
  • Cytoskeleton definition and components
  • Cell signaling

The lessons in this chapter are taught by knowledgeable instructors, who provide detailed descriptions and examples to aid in your study of cell structures and functions.

Praxis Biology & General Science: Cell Structures and Functions Objectives

The Praxis II Biology and General Science test measures your ability to teach these topics to secondary students. You'll find eight different content areas on this test that will assess your knowledge of cellular and molecular biology, science principles and methodologies, genetics, evolution, animal and plant diversity, chemistry, earth and space science, physics and ecology.

The molecular and cellular biology content area of the test is where you'll find questions on cell structure and function. This content area has 18 questions and represents 15% of the entire test, which consists of 120 questions, all in multiple-choice format. The self-assessment quizzes that accompany each lesson can prepare you for the type of questions you'll find on the test.

12 Lessons in Chapter 15: Praxis Biology & General Science: Cell Structures and Functions
Test your knowledge with a 30-question chapter practice test
Eukaryotic and Prokaryotic Cells: Similarities and Differences

1. 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.

Bacterial Cell Walls: Structure, Function & Types

2. Bacterial Cell Walls: Structure, Function & Types

The bacterial cell wall has to be strong to prevent cell lysis but also porous to allow transport across the cell membrane. In this lesson, we will examine the structure of the bacterial cell wall and how it accomplishes both of these crucial tasks.

How a Phospholipid Bilayer Is Both Hydrophobic and Hydrophilic

3. 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?

The Fluid Mosaic Model of the Cell Membrane

4. 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.

Plant Cell Structures: The Cell Wall and Central Vacuole

5. 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!

Passive Transport in Cells: Simple and Facilitated Diffusion & Osmosis

6. 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.

Active Transport in Cells: Definition & Examples

7. 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!

Endocytosis and Exocytosis Across the Cell Membrane

8. 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.

Structure of the Nucleus: Nucleolus, Nuclear Membrane, and Nuclear Pores

9. 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.

The Ribosome: Structure, Function and Location

10. 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.

The Endomembrane System: Functions & Components

11. 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!

The Cytoskeleton: Microtubules and Microfilaments

12. 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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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Other Chapters

Other chapters within the Praxis Biology and General Science: Practice and Study Guide course

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