About This Chapter
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
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.
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.
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.
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.
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.
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.
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!
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Other chapters within the Fundamental Biology course
- Basic Terms & Skills in Biological Science
- Basic Science Lab Skills
- Inorganic Chemistry Review for High School Biology
- Introduction to Organic Chemistry
- Enzyme Function, Interactions & Regulation
- Cell Biology
- Requirements of Biological Systems
- Cell Communication
- Cellular Metabolism & Respiration
- Cell Growth & The Process of Cell Division
- The Nucleotide Structure of DNA & RNA
- Processes & Steps of DNA Replication
- The Transcription and Translation Process
- Mendelian Genetics & Mechanisms of Heredity
- Types & Effects of Genetic Mutations
- DNA Technology and Genomics
- Bacterial Biology Overview
- The Origin of the Universe and Life on Earth
- Geologic Time
- Evolution Overview
- Phylogeny and the Classification of Organisms
- Plant Biology
- Plant Reproduction and Growth
- Introduction to Fungi
- Introduction to Invertebrates
- Introduction to Vertebrates
- Physiology I: The Circulatory, Respiratory, Digestive, Excretory, and Musculoskeletal Systems
- Physiology II: The Nervous, Immune, and Endocrine Systems
- Animal Reproduction and Development
- Human Reproductive Systems
- Ecology and the Environment
- Human Effects on the Environment
- Animal Behavior
- Basic Molecular Biology Laboratory Techniques
- Analyzing Scientific Data