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Read e-book online About Life: Concepts in Modern Biology PDF

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 contemporary advances in cellphone and molecular biology to strengthen an account of the residing country that applies to all organisms (and basically to organisms). This account is then used to discover questions on evolution, the foundation of lifestyles, and the opportunity of extraterrestrial existence. the unconventional procedure taken by way of this e-book to matters in biology will curiosity and be available 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 addition, there are the prokaryotes. Such is the variety of cell forms and functions that no single concrete definition or 6. AS IF STANDING STILL 53 characterisation of “livingness” is possible. ” has to transcend description; it must be abstract. Moreover, as we have seen, living cells are vastly complex, so to describe any cell fully would require an impossible amount of detail. A manageable definition or characterisation must cut through this morass of specifics to generalities; so our answer must be general as well as abstract.

For this, use a bigger box (30-40 cm edges), put into it the same contents as you put into the animal cell, and add a fully-inflated party balloon. Ideally, the balloon should sit in the middle of the box. It represents a fluid-filled vacuole, or space, which occupies the central region of a typical plant cell. If the cell is in the green part of the plant there ought to be chloroplasts as well - easily simulated with gherkins. Chloroplasts are about the same sizes as mitochondria. For a plant cell, the thick cardboard of the box adequately represents the cell wall (which, like cardboard, it is normally made of cellulose); and for many plant cells the rigid geometry of the box is also fairly realistic.

Individually it strikes us as highly undesirable. 5 They can be made to divide outside the body by culturing them under special conditions, but with difficulty. g. in your skin) can be provoked into dividing faster by injury - they produce more cells to seal the hole. In cancers, a specialised cell loses some or most of its specialisation and starts dividing again, sometimes without limit; if it becomes mobile as well, secondary cancers might develop elsewhere in the body. 26 Chapter 3 Biologically speaking it is probably a good thing as well as an inevitable one.

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

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