About Life: Concepts in Modern Biology - download pdf or read online

By Paul S. Agutter, Denys N. Wheatley

ISBN-10: 9048173639

ISBN-13: 9789048173631

This publication makes use of smooth organic wisdom to take on the query of what distinguishes dwelling organisms from the non-living global. The authors first draw on contemporary advances in telephone and molecular biology to enhance an account of the residing country that applies to all organisms (and purely to organisms). This account is then used to discover questions about evolution, the beginning of lifestyles, and the potential for extraterrestrial existence. the unconventional strategy taken by means of this ebook to matters in biology will curiosity and be available to either the final reader in addition to scholars and experts within the box.

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A protein molecule is around ten times longer than a metabolite molecule. A molecule of RNA is hundreds of times longer than a protein. A mitochondrion is three or four times longer still, and a great deal fatter than an RNA molecule. Cargoes of such widely different sizes are unlikely to be moved efficiently by a single mode of transport. Therefore, the cell has a variety of transport mechanisms. The main ingredient of a cell is water. e. 1015) water molecules. Picture a small lake fed by fast-flowing streams and drained by a large river; the level of water in the lake remains practically constant, and underwater currents flow, but no individual water molecule stays in the lake for long.

Some major arteries contain pressure sensors. These sensors send messages along nerves to part of the brain, which then alters the heart rate and the diameters of some blood vessels. The effect is to keep the pressure within narrow limits. If the sensors detect a fall in arterial blood pressure, the heart speeds up and the vessels contract. These changes counteract the fall. If the sensors detect a rise, the heart slows down and the vessels dilate to bring the pressure back to normal. In other words, blood pressure is maintained by a feedback control system analogous to the thermostatic control of room temperature.

4-2: an overview of intermediary metabolism, showing how catabolism and anabolism are interconnected. 4. HIVES OF INDUSTRY 35 This diagram does not explicitly mention the storage compounds made from surplus nutrients. However, storage compounds are examples of "products synthesised by the cell". As we mentioned earlier, glucose can be converted to glycogen (animal starch), an important reserve fuel in many types of animal cells. In animals such as humans, excess carbohydrate can also be converted via certain intermediates to fat, which is then stored; some of us are aware of this process from depressing personal experience.

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

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