11th Hour: Introduction to Biology (Eleventh Hour - Boston) - download pdf or read online

By David L. Wilson

ISBN-10: 0632044160

ISBN-13: 9780632044160

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Fats are used for insulation, padding, and as a storage form for chemical energy in animals. Phospholipids also contain glycerol, but only two fatty acid chains are attached. The third carbon on the glycerol is occupied by a phosphate group. Additional functional groups can be added to the phosphate group, forming different kinds of phospholipids. " We will see that phospholipids playa very important role in the structure of cell membranes. Not all lipids contain fatty acid chains. Cholesterol is a lipid that consists of four, interlinked hydrocarbon rings, with a few functional groups attached to the rings.

In a specially modified form they are used as an energy source that allows living cells to do work, from driving a chemical reaction to moving packages around in cells. This modified form is called a nucleoside triphosphate. Such molecules have three linked phosphate groups. The most commonly used one in cells is adenosine triphosphate, or ATP, whose structure is adenine-ribose-phosphate-phosphate-phosphate. ATP is a source of energy (so-called free energy, as we will call it in Chapter 6) that living cells use to do work.

1 to determine how much a mole of C6 H 1z 0 6 weighs. 6. How many molecules are in half a mole? Topic Test 2: Answers 1. False. Ionic bonds are between atoms that have gained or lost full electrons. Covalent bonds involve shared electrons. 2. False. Unequal sharing of electrons produces polar covalent bonds. 3. d. Unequal sharing produces a polar bond. Carbon bonds to hydrogen with a nonpolar bond. 4. d. Eighteen grams of water equals 1 mole of water. Twelve grams of carbon atoms. None of the others are I mole.

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11th Hour: Introduction to Biology (Eleventh Hour - Boston) by David L. Wilson

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