About This Chapter
Praxis Biology: Cell Structures and Functions - Chapter Summary
The lessons in this chapter will teach you about types of cells, such as eukaryotic and prokaryotic cells. You will look at the structure of cells, including the nucleus and the cell wall. Other lessons cover the function of each cell part. By the end of these video lessons, you will have an understanding of topics including:
- How the phospholipid bilayer is both hydrophobic and hydrophilic
- The fluid mosaic model of the cell membrane
- Plant cell structures
- Passive and active transport in cells
- Structure, location and function of the ribosome
- The endomembrane system
- Osmolarity and water potential
- Cell signaling
Experienced instructors guide you through each topic, using examples to clarify their points. You can prepare for the exam by testing your knowledge with the quizzes that follow each lesson, and there are links that make it easy to review key items on the video.
Praxis Biology: Cell Structures and Functions Chapter Objectives
In many states, candidates for teacher certification must pass Praxis examinations for the subjects they wish to teach. The biology content knowledge exam has 150 multiple-choice questions and assesses test-takers for competency to teach the subject at the secondary school level. There is a two-hour time limit, and the exam can be administered as a paper test or on computer. The Praxis Biology exam has six sections, and the material taught in this chapter is in section II, Molecular and Cellular Biology. This section, with 38 questions, comprises about 25% of the test.
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.
Eukaryotic and Prokaryotic Cell Flashcards
In this set of flashcards, you'll get to know eukaryotic and prokaryotic cells. By going through this set you'll be able to identify different cells as eukaryotic or prokaryotic based on their cell structures.
3. 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.
4. 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?
5. 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.
6. 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!
7. 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.
8. 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!
9. 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.
10. 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.
11. 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.
12. 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!
13. 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.
14. The Mechanisms of Hormone Action
To keep everything regulated, your body constantly needs to send messages to different cells. It does this by using hormones. In this lesson we'll look at how hormones work and what they do.
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Other chapters within the Praxis Biology (5235): Practice & Study Guide course
- Praxis Biology: Science Principles - Processes and Disciplines
- Praxis Biology: Science Principles - Hypotheses, Theories and Change
- Praxis Biology: Science Principles - Numbers
- Praxis Biology: Science Principles - Interpretation and Models
- Praxis Biology: Laboratory Safety
- Praxis Biology: Laboratory Equipment & Measurements
- Praxis Biology: Molecular Structure Basics
- Praxis Biology: Chemical Reactions
- Praxis Biology: Biological Molecules and Processes
- Praxis Biology: Cellular Energy Flow
- Praxis Biology: Cellular Division
- Praxis Biology: DNA and Replication
- Praxis Biology: RNA and Gene Expression
- Praxis Biology: Mutations and Other Genetic Changes
- Praxis Biology: Biology Lab Techniques
- Praxis Biology: DNA Technology
- Praxis Biology: Genetics and Inheritance
- Praxis Biology: Human Genetics
- Praxis Biology: Species, Populations and Evolution
- Praxis Biology: Origin of Life on Earth
- Praxis Biology: Classification of Organisms
- Praxis Biology: Human Anatomy and Physiology
- Praxis Biology: Immunology
- Praxis Biology: Animal Reproduction and Development
- Praxis Biology: Plant Biology
- Praxis Biology: Plant Reproduction & Growth
- Praxis Biology: Population Ecology
- Praxis Biology: Ecosystem Ecology
- Praxis Biology: Human Impacts on the Environment
- Praxis Biology: Environment and Society
- Praxis Biology Flashcards