Microbiology: A Systems Approach
Microbiology: A Systems Approach
4th Edition
ISBN: 9780073402437
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 4, Problem 9CTQ

9.

Summary Introduction

To compare:

Main characteristics of the three domains of life: Bacteria, Archaea, and Eukarya.

Introduction:

The microscopic organisms occur as “uni-or multi-cellular” along with cluster of cells. There are various species of microorganisms covering almost the Earth. The microorganisms are divided into major types: “viruses”, “archaea”, “bacteria”, “fungi”, “protozoa”, and “algae”. The microorganisms are not generally seen from naked eyes.

a.

Summary Introduction

To create:

A branched-tree diagram showing the evolutionary relationship among three domains of life and enlist the characteristics that have led microbiologists to believe that Archaea are more closely related to eukaryotes than to bacteria.

Introduction:

The three major domains of life forms evolved from a last universal common ancestor are “Bacteria”, “Archaea”, and “Eukarya”. There are certain similarities between all three domains, while there are certain contrasting features that separate them.

b.

Summary Introduction

To determine:

Archaeal adaptations that make these microbes most suited to extreme habitats.

Introduction:

Archaea includes the group of ancient bacteria. They contain single and circular chromosomes. Nucleus and membrane bound organelles are absent. Peptidoglycans and cell wall are absent in Archaea.

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Microbiology: A Systems Approach

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