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Ch 18: Holt McDougal Biology Chapter 18: Viruses & Prokaryotes

About This Chapter

The Viruses & Prokaryotes chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with viruses and prokaryotes. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Viruses & Prokaryotes textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Viruses & Prokaryotes chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the topics on viruses and prokaryotes you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Attributes of viruses
  • About influenza and HIV
  • How viruses get us sick and prevention methods
  • The definition and functions of prokaryotes
  • The benefits that prokaryotes provide
  • What bacteriophages are
  • Eubacteria and archaebacteria
  • How certain strains of bacteria can develop antibiotic resistance

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7 Lessons in Chapter 18: Holt McDougal Biology Chapter 18: Viruses & Prokaryotes
What Are Viruses? - Definition, Structure & Function

1. What Are Viruses? - Definition, Structure & Function

In this lesson, you'll learn some historical facts about viruses and the material they are composed of. Find out more as we review the capsid, nucleic acids, the viral envelope, viruses, virions, bacteriophages and virology.

Shapes of a Virus: Helical, Icosahedral, Prolate, Complex & Enveloped

2. Shapes of a Virus: Helical, Icosahedral, Prolate, Complex & Enveloped

Learn about the different shapes viruses can have, such as helical, icosahedral, prolate, complex and enveloped. Find out why one shape is particularly useful from an energetic standpoint.

Viruses: Bacteriophage Lytic and Lysogenic Cycles

3. Viruses: Bacteriophage Lytic and Lysogenic Cycles

Viruses are generally not only our enemy but also the enemy of many other organisms. Bacteriophages are viruses that infect specific bacteria. In this lesson, we'll discuss their basic structure and infection cycle.

Flu Viruses, HIV and Immune System Evasion

4. Flu Viruses, HIV and Immune System Evasion

Why is it that our immune systems can protect us from some viruses but not others? We've eradicated smallpox by using vaccines, so why do influenza and HIV remain such dangerous health risks? In this lesson about viruses, we'll explore these questions and learn how influenza and HIV continue to evade the human immune system.

Vaccination and Immunotherapy

5. Vaccination and Immunotherapy

This lesson will discuss the basics of how diseases can be prevented or treated using our own immune system's components. We'll talk about vaccination and immunotherapy as well as some specific examples, such as the BCG vaccine, monoclonal antibodies, and more.

The Evolution of Prokaryotes: Archaebacteria and Eubacteria

6. The Evolution of Prokaryotes: Archaebacteria and Eubacteria

The first living organisms on Earth were bacteria. These small organisms still exist today and are responsible for many things. In this lesson, we will explore both ancient bacteria and true bacteria.

How Prokaryotes Impact Humans

7. How Prokaryotes Impact Humans

In this lesson, we will discuss the beneficial and harmful ways that prokaryotes can impact humans. We will define the terms prokaryote, symbiosis, mutualistic bacteria, and pathogenic bacteria.

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