Microbiology: A Systems Approach
Microbiology: A Systems Approach
5th Edition
ISBN: 9781259706615
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 24, Problem 8MCQ
Summary Introduction

Introduction:

The organisms that are too small to see from naked eyes are microorganisms. All the archaea and bacteria are under the category of microorganisms, while some of the eukaryotes can be termed as microorganisms.

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The first step for directly linking a microbe to a specific disease according to Koch's postulates is to A.isolate microbes from the blood of healthy animals. B. culture the blood or other body fluid from a diseased animal using nutrient medium.   C. inject a sample of blood or other body fluid from a diseased animal into a healthy animal. D. obtain a sample of blood or other body fluid from a diseased animal.
An infectious dose of several million cells in enteric infections seems like a lot. a. In terms of the size and abundance of microbes, could you see a cluster containing that many cells with the naked eye? b. About how long would it take an average bacterial species to reach the infectious dose of a million cells starting from a single cell? c. Why do enteric diseases require a relatively higher infectious dose than nonenteric diseases? d. Explain why antimicrobic therapy used on gram-negative bacterial infections could actually lead to illness rather than cure it
Which of the following factors is a unique event in the evolution of the niche of microbes? A. Variable surrounding conditions B. High mutation rates C. Transfer of DNA D. Selection among microbial populations
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