Ch 18: Viruses

About This Chapter

The viruses chapter of this Fundamental Biology course helps students catch up on their understanding of viruses and earn better grades. This remedial help resource uses simple and fun videos that are about five minutes long.

How it works:

  • Identify the viruses concepts you struggle with most.
  • Find videos on those topics within this chapter.
  • Watch fun videos, pausing and reviewing as needed.
  • Complete sample problems and get instant feedback.
  • Apply what you've learned about viruses to your classroom work.

Viruses topics that you'll better understand through the lessons in this chapter:

  • Defining and understanding the structure and function of viruses
  • Identifying shapes of a virus, including helical, icosahedral and prolate
  • Explaining the life cycle of a virus
  • Stating how viruses are classified
  • Listing ways DNA viruses replicate in their host
  • Detailing how RNA viruses take over cells to reproduce
  • Identifying the ways viruses mutate and avoid the immune system
  • Defining bacteriophage lytic and lysogenic cycles
  • Explaining flu viruses, HIV and the evasion of the immune system

7 Lessons in Chapter 18: Viruses
Test your knowledge with a 30-question chapter practice test
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.

The Life Cycle of a Virus: How Viruses Live, Attack & Replicate

3. The Life Cycle of a Virus: How Viruses Live, Attack & Replicate

Find out how viruses infect and replicate as we explore the important steps of the virus life cycle, including attachment, uncoating, penetration, replication, and release, as well as the lysogenic and lytic cycles.

Classification of Viruses: Viral Genome and Replication Scheme

4. Classification of Viruses: Viral Genome and Replication Scheme

Find out how viruses are classified based on their being double-stranded, single-stranded, positive-sense, negative-sense, or by having something called reverse transcriptase.

Replication of DNA Viruses

5. Replication of DNA Viruses

This lesson will give you a basic overview of how DNA viruses replicate inside of a host cell. We will cover the entry, integration, replication and release of DNA viruses.

Replication of RNA Viruses

6. Replication of RNA Viruses

This lesson will give you a basic overview of how different types of RNA viruses replicate inside of an animal cell. We will cover the essence of being double-stranded and retroviruses, as well as positive-and negative-sense RNA viruses.

How Viruses Mutate: Antigenic Drift and Antigenic Shift

7. How Viruses Mutate: Antigenic Drift and Antigenic Shift

This lesson will discuss the major ways by which viruses, notably the flu virus, mutates. We will talk about recombination, reassortment, antigenic drift, antigenic shift, and more!

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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