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12 - Life on earth: the role of proteins

Published online by Cambridge University Press:  18 December 2009

By
Jayanth R. Banavar  and
Amos Maritan
Edited by
John D. Barrow ,
Simon Conway Morris ,
Stephen J. Freeland  and
Charles L. Harper, Jr
Jayanth R. Banavar
Affiliation:
Pennsylvania State University
Amos Maritan
Affiliation:
Instituto Nazionale per la Fisica della Materia, Dipartimento da Fisica G. Galilei, Universita di Padova
John D. Barrow
Affiliation:
University of Cambridge
Simon Conway Morris
Affiliation:
University of Cambridge
Stephen J. Freeland
Affiliation:
University of Maryland, Baltimore
Charles L. Harper, Jr
Affiliation:
John Templeton Foundation
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Summary

Introduction

It is now believed that our universe was created around 13.8 billion years ago. Our planet earth came into existence around 4.5 billion years ago. For nearly a billion years or so after it was formed, the earth was stark and bereft of life. The matter contained on earth was inorganic with relatively small molecules. There were endless rock formations, oceans, and an atmosphere.

And then there was life.

The problem of how life was created is a fascinating one. Our focus is on looking at life on earth and asking how it works. The lessons we learn provide hints to the answer to the deep and fundamental question pondered by our ancients: Was life on earth inevitable? Then there are the questions posed by Henderson [1]: Is the nature of our physical world biocentric? Is there a need for fine-tuning in biochemistry to provide for the fitness of life in the cosmos – or, even less ambitiously, for life here on earth? Surprisingly, as we will show, a physics approach turns out to be valuable for thinking about these questions.

All living organisms have a genetic map consisting of a one-dimensional string of information encoded in the DNA molecule. An essential question that one seeks to answer is how an organism converts that information into a three-dimensional living being.

Life has many common patterns. All living cells follow certain simple “universal” themes.

Type
Chapter
Information
Fitness of the Cosmos for Life
Biochemistry and Fine-Tuning
 , pp. 225 - 255
Publisher: Cambridge University Press
Print publication year: 2007

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