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Read e-book online Biochemistry Demystified PDF

By Sharon Walker, David McMahon

ISBN-10: 0071495991

ISBN-13: 9780071495998

ISBN-10: 0071643486

ISBN-13: 9780071643481

Examine BIOCHEMISTRY with no stressing out your mind CELLSTrying to appreciate the chemical approaches of residing organisms yet having difficulty metabolizing the advanced strategies? here is your lifeline! Biochemistry Demystified is helping synthesize your figuring out of this significant topic.You'll commence with a assessment of simple chemical strategies and a glance at mobile buildings and mobile department. subsequent, you are going to learn carbohydrates, lipids, proteins, nucleic acids, nucleotides, and enzymes. Glycolysis, the citric acid cycle, oxidative phosphorylation, and the keep watch over of chemical procedures around out the insurance. enormous quantities of examples and illustrations make it effortless to appreciate the fabric, and end-of-chapter questions and a last examination support toughen studying.

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Sample text

CHAPTER 1 The Chemistry of Biomolecules 21 VALENCE STRUCTURE OF CARBON Carbon has six electrons. • Major electron energy shell number one is full with two electrons. • Shell number two has four electrons and can hold eight electrons—it lacks four electrons. To obtain these four valence electrons, carbon will form covalent bonds with hydrogen, oxygen, sulfur, and nitrogen and other carbon atoms, allowing the formation of the biomolecules that constitute life. Carbon will also form a single or a double bond with other carbon atoms (or oxygen or nitrogen).

The oil drops stay intact. Now add another drop of oil to the container. And then another. The droplets will coalesce, as if they are seeking each other’s company and are avoiding the water. Chemicals that behave this way are called hydrophobic, or water-hating. The underlying reason for their behavior in water is that they have no electrical charge at their surface. As discussed in Chap. 1, water molecules are polar, that is, the molecule exhibits partial electrical charges. One end, the oxygen end, is electronegative.

Inside of this membrane exists a marvelous chemical system that allows each cell to grow, divide, fight off intruders, take in important reagents, and excrete other materials that are either waste products or important products of this particular cell’s metabolism. To understand the forces that create the membrane, envision a drop of oil in a container of water. The oil drops stay intact. Now add another drop of oil to the container. And then another. The droplets will coalesce, as if they are seeking each other’s company and are avoiding the water.

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Biochemistry Demystified by Sharon Walker, David McMahon

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