By Paul S. Agutter, Denys N. Wheatley

ISBN-10: 9048173639

ISBN-13: 9789048173631

This publication makes use of glossy organic wisdom to take on the query of what distinguishes dwelling organisms from the non-living international. The authors first draw on fresh advances in mobile and molecular biology to advance an account of the dwelling nation that applies to all organisms (and in simple terms to organisms). This account is then used to discover questions on evolution, the beginning of lifestyles, and the potential for extraterrestrial existence. the unconventional strategy taken by way of this ebook to matters in biology will curiosity and be obtainable to either the overall reader in addition to scholars and experts within the box.

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Extra resources for About Life: Concepts in Modern Biology

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In many instances, one part of protein molecule functions as a "travel ticket", which is recognised by a "ticket inspector" at the target site but is not valid for other destinations. This ensures that the protein stops at its ordained destination, but does not explain how it travels there. The cytoplasmic transport processes for proteins and RNAs are certainly efficient, but the mechanisms are not clear and the subject is a matter of controversy. In some cases, movements of the cytoskeleton might drag a protein along (see below).

Key” enzymes probably help to determine the balance between alternative pathways, but in general they contribute no more to the rate of a particular pathway than any other enzyme in that pathway. The third type of mechanism depends on transport rates. If nutrients and metabolites are supplied more rapidly, the rate of each metabolic pathway that uses them will increase. Slower supply rates mean slower metabolism. Not much research has been done on this aspect of cellular homeostasis, so details are lacking.

The "internal environment" is the environment in which the body's cells live. Unless this environment stays nearly constant the cells will die. In the late 1920s, the American physiologist Walter Cannon invented a word to denote the constancy of the internal environment and the mechanisms responsible for maintaining it: homeostasis. Once again, the roots of the word are Greek: “homeostasis” means "as if standing still". The study of homeostatic mechanisms, the control of parameters through feedback, has 6.

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About Life: Concepts in Modern Biology by Paul S. Agutter, Denys N. Wheatley


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