PRINCIPLES OF LIFE
PRINCIPLES OF LIFE
3rd Edition
ISBN: 9781319017712
Author: HILLIS
Publisher: MAC HIGHER
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Chapter 18, Problem 1.1Q
Summary Introduction

To define: What evidence links the eukaryotic origin with archaea bacteria rather than bacteria.

Introduction: The most abundantly found living organisms found on the Earth are prokaryotes. Still, only a small portion of prokaryotic diversity has been analyzed so far.

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Genetic studies reveal that all life forms share a common ancestor. Similarly, eukaryotes have a common ancestor with some group of archaea. The earliest division in the tree of life is between archaea and bacteria. Then, the eukaryotes are divided or branched off from archaea, having developed specialization like organelles and nucleus that separated the eukaryotes from the prokaryotes.

Some biologists view the eukaryotic origin as a result of fusion of modern bacteria and modern prokaryotic archaea. Others view the divergence of eukaryotes from prokaryotic archaea as an event that took place before endosymbiosis. Archaea possess many metabolic pathways and genes that link them with the eukaryotes, particularly the enzymes of transcription and translation. Also, archaea exhibit different chemical reactions during their metabolic processes and various sources of energy like eukaryotes.

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