Human Physiology: An Integrated Approach (7th Edition)
Human Physiology: An Integrated Approach (7th Edition)
7th Edition
ISBN: 9780321981226
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Chapter 24, Problem 1CC
Summary Introduction

To describe: The differences between a virus and a bacterium.

Introduction: A pathogen is a biological agent that causes disease or illness to its host. It is most commonly used for agents that disrupt the normal physiology of a multicellular animal or plant. The most prevalent infectious diseases are caused by bacterial and viral pathogens.

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Bacteria and viruses are different from each other in several ways. The following table explains the differences between a virus and a bacterium:

CriteriaVirusBacterium
StructureA virus does not have a cell. It consists of nucleic acid (DNA or RNA) surrounded by a coat of viral proteins called as capsid. Some viruses have an envelope of proteins and phospholipids derived from their host’s cell membrane.The bacterium is a cell. It has a cell membrane that is often enclosed by a cell wall. Some bacteria also have an additional protective layer called as capsule.
Living conditions and reproductionViruses are obligate parasites, which mean they need a host organism to live on and get nutrients from its host. They must use the intracellular machinery of a host cell to replicate.Most bacteria can survive and reproduce outside a host if they have the required nutrients, temperature, pH, and so on.
Susceptibility to drugsSome viral infections can be managed with antiviral drugs that target definite stages of viral replication.Most bacteria are susceptible to drugs called antibiotics. These drugs act can kill them or inhibit their growth.

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What Is A Virus ? ; Author: Peekaboo Kidz;https://www.youtube.com/watch?v=YS7vsBgWszI;License: Standard YouTube License, CC-BY