By Raven, Johnson.
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How long will it take for the sample to contain 1 milligram of radium-226? 4. What is the octet rule, and how does it affect the chemical behavior of atoms? 5. What is the difference between an ionic bond and a covalent bond? Give an example of each. • Bonds • Ionic Bonds • Bonds Water is the cradle of life. • The chemistry of life is the chemistry of water (H2O). The central oxygen atom in water attracts the electrons it shares with the two hydrogen atoms. This charge separation makes water a polar molecule.
Imagine: there are more water molecules in a cup than there are stars in the sky. Many other molecules are gigantic, compared with water, consisting of thousands of atoms. 1). These enormous molecules, almost always synthesized by living things, are called macromolecules. As we shall see, there are four general types of macromolecules, the basic chemical building blocks from which all organisms are assembled. 1 Molecules are the building blocks of life. The Chemistry of Carbon In chapter 2 we discussed how atoms combine to form molecules.
Iron is transported in blood by the protein transferrin. 4 Some of the more common structural proteins. (a) Collagen: strings of a tennis racket from gut tissue; (b) fibrin: scanning electron micrograph of a blood clot (3000×); (c) keratin: a peacock feather; (d) silk: a spider’s web; (e) keratin: human hair. 4. Support. 4) include keratin in hair, fibrin in blood clots, and collagen, which forms the matrix of skin, ligaments, tendons, and bones and is the most abundant protein in a vertebrate body.