Ch 19: Viruses in Biology: Help and Review

About This Chapter

The Viruses in Biology chapter of this High School Biology Help and Review course is the simplest way to master an understanding of viruses. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn about viruses in biology.

Who's it for?

Anyone who needs help learning or mastering high school biology material will benefit from taking this course. There is no faster or easier way to learn biology. Among those who would benefit are:

  • Students who have fallen behind in understanding the life cycle of a virus and viruses in biology
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about viruses
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the virus chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the virus chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any virus question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in a virus unit of a standard high school biology course. Topics covered include:

  • Categories of viruses
  • DNA and RNA replication of viruses
  • Flu viruses
  • Shapes of viruses
  • Virus mutations

23 Lessons in Chapter 19: Viruses in Biology: Help and Review
Test your knowledge with a 30-question chapter practice test
What Are Viruses? - Definition, Structure & Function

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

A virus is defined as a microscopic and extremely infectious agent that invades and spreads, once inside a host. This lesson will dive into virology (the study of viruses), the history and structure of viruses, and how these infections exist in daily life.

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

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

Overview key descriptions of different viral shapes. Distinguish between the purposes of helical, icosahedral, prolate, enveloped, and complex shapes.

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

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

The life cycle of a virus includes several steps, including attachment, penetration, uncoating, replication, maturation, and release. Explore how viruses live, attack host cells, and replicate, and then learn the difference between lysogenic and lytic life cycles.

Classification of Viruses: Viral Genome and Replication Scheme

4. Classification of Viruses: Viral Genome and Replication Scheme

Viruses are classified according to their physical and chemical characteristics. Learn about factors involved in classification, including double- and single-stranded viruses, positive and negative sense, the Baltimore classification system, and reverse transcriptase.

Replication of DNA Viruses

5. Replication of DNA Viruses

Replication of DNA viruses occurs when a host cell's polymerase makes mRNA, which is sent back to the host cell's ribosomes. Discover replication strategies, DNA viruses' entry and integration, and the whole process of DNA replication and its release.

Replication of RNA Viruses

6. Replication of RNA Viruses

Ribonucleic acid (RNA) is a molecule found in cells that does many tasks for the human body, including the transformation of DNA information into proteins. Learn about RNA viruses and their replication strategies. Explore the features and viruses of RNA, such as double-stranded, positive and negative sense, and reverse transcription.

How Viruses Mutate: Antigenic Drift and Antigenic Shift

7. How Viruses Mutate: Antigenic Drift and Antigenic Shift

Viruses mutate and adapt to become more infectious. Explore the different ways viruses mutate, and learn about antigenic drive, antigenic shift, and viral recombination.

Viruses: Bacteriophage Lytic and Lysogenic Cycles

8. Viruses: Bacteriophage Lytic and Lysogenic Cycles

Viruses can infect many organisms, even bacteria. A bacteriophage is a special kind of virus that infects bacteria. Explore the way bacteriophages replicate using the lytic and lysogenic cycle.

Flu Viruses, HIV and Immune System Evasion

9. Flu Viruses, HIV and Immune System Evasion

Some viruses, such as influenza and HIV, continue to spread and infect despite the human immune system. Understand characteristics of these viruses, such as rapid or high mutation rates, and how they help in evading the human body's protections.

Chicken Pox Virus Structure and Function

10. Chicken Pox Virus Structure and Function

Chickenpox illness occurs due to the varicella zoster virus (VZV). Examine the structure and composition of this virus and how it infects cells, causing specific conditions such as shingles.

Epstein Barr Virus: Structure and Function

11. Epstein Barr Virus: Structure and Function

The Epstein Barr virus affects more individuals per year than you may know. If you catch it, it will make you very sick. We'll explore here what Epstein Barr is, what it does, and what it looks like.

Hepatitis C Virus: Structure and Function

12. Hepatitis C Virus: Structure and Function

Hepatitis C virus causes both short-term illness and chronic liver disease leading to cirrhosis and cancer. Learn about the virus and how it replicates.

Rabies Virus: Structure and Function

13. Rabies Virus: Structure and Function

Rabies is a neurological disease spread by the saliva of infected animals. While it can be prevented by vaccination, it is deadly once symptoms appear. Learn more about this disease and the virus that causes it.

Rubella Virus: Structure and Function

14. Rubella Virus: Structure and Function

The vaccines that children are given are meant to prevent their getting sick. One of the vaccines they get is the MMR shot, meant to prevent measles, mumps, and rubella. You may have heard of measles and mumps, but what is rubella? We discuss this further.

Smallpox Virus: Structure and Function

15. Smallpox Virus: Structure and Function

Smallpox is caused by a large virus that can go through several different stages to infect cells. This lesson will discuss the different forms of the virus and how they continue the smallpox infection from cell to cell.

Tobacco Mosaic Virus: Structure and Function

16. Tobacco Mosaic Virus: Structure and Function

Tobacco mosaic virus is commonly found in tobacco plants, appearing in a 'mosaic' of discoloration patches. Learn the structure and function of this virus, including its effects on agriculture.

Variola Virus: Structure and Function

17. Variola Virus: Structure and Function

This lesson will discuss variola virus, the virus that causes smallpox. You will learn the functions of different parts of the virus structure, and how these parts work together to cause disease.

West Nile Virus: Structure and Function

18. West Nile Virus: Structure and Function

The West Nile virus is an illness transmitted by mosquitoes. Individuals infected with this virus may be completely asymptomatic, or end up with extreme complications.

Yellow Fever Virus: Structure and Function

19. Yellow Fever Virus: Structure and Function

The yellow fever virus can be deadly and examining its structure and function is vital to obtain a better understanding of how it works. Investigate its genomes, proteins, and protective covering, discover the vectors of transmission and understand the symptoms.

Hepatitis A Virus: Structure and Function

20. Hepatitis A Virus: Structure and Function

This lesson will describe the structure and function of the virus that causes hepatitis A. After the lesson, there will be a few questions to test what you have learned.

Hepatitis B Virus: Structure and Function

21. Hepatitis B Virus: Structure and Function

Hepatitis B is part of a family of similar viruses that affect the liver. It can be deadly, but is often treatable, and for the past 30 years we've had a vaccine for it. This lesson will further explore the structure and function of the hepatitis B virus.

Herpes Simplex Virus: Structure and Function

22. Herpes Simplex Virus: Structure and Function

Herpes is a virus that affects humans. It is one of the most common viruses to infect humans as it comes in a variety of different types. We look at the specific types of herpes simplex virus here.

Molluscum Contagiosum Virus: Symptoms & Treatment

23. Molluscum Contagiosum Virus: Symptoms & Treatment

Many diseases are found in human beings, and some are worse than others. A harmless virus, Molluscum contagiosum, is easily passed around and most often found in children. Read on to learn more about symptoms and treatment.

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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More Exams
There are even more practice exams available in Viruses in Biology: Help and Review.

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