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 13, Problem 1MCQ
Summary Introduction

Introduction:

The humans are connected with a vast array of microbes known as resident biota. A holobiont includes the human body along with resident biota. These microbes of resident biota also prevent the overgrowth of harmful microorganisms.

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Answer to Problem 1MCQ

Correct answer:

The best descriptive term for the resident biota is commensals. Therefore, option (a) is correct.

Option (a) is given as “commensals”.

Explanation of Solution

Justify reasons for the correct statement:

Some organisms show evolution along with its human hosts and produce a complex relationship in which the effects of normal biota are not deleterious to the host. Normal biota is generally either in a commensal or mutualistic association with their hosts because microbes exist in different kinds of relationships with their hosts.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “parasites”.

The parasites are the organisms which can live on host body, but they do not live in commensals like microorganisms. Hence, it is a wrong answer.

Option (c) is given as “pathogens”.

Not all pathogens live in commensals. Only some microorganisms live in commensals. Hence, it is a wrong answer.

Option (d) is given as “mutualists”.

Mutualists are the organisms which live in a relationship such that both the organisms are benefitted. Hence, it is a wrong answer.

Hence, options (b),(c), and(d) are incorrect.

Conclusion

The commensals are the microorganisms which live in a group. The resident biotas are also commensals.

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