Lecture06 - 1 LECTURE 6 First we will finish up Chapter 3 -...

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1 LECTURE 6 First we will finish up Chapter 3 - Digestion, Absorption, and Transport Hormones of interest in digestion and absorption : Gastrin Secretin Cholecystokinin Lecture 06: Chapter 4 - The Carbohydrates: Sugars, Starches, and Fibers A Primer in Chemistry : Appendix B in Whitney & Rolfes; 10 th edition OVERVIEW: Chemical bonds are formed between atoms via electronic interactions. The most important chemical bonds in biological molecules are covalent bonds. Covalent bonds are formed by electron-pair sharing between atoms. The science of chemistry is the science of bond rearrangements. Substances: Elements and Compounds Molecules are the smallest part of a substance that still retains the chemical and physical properties of that substance. Molecules are composed of atoms. If all the atoms in a molecule are alike, the substance is an element . Over 100 different elements are known. If the molecule contains different kinds of atoms, it is called a compound . The Nature of Atoms
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2 Atoms : Each type of atom has a characteristic number of positively charged particles called protons in its nucleus and an equal number of negatively charged electrons forming a cloud surrounding the nucleus. The number of protons in an atom defines the atom; this number is called the atomic number of the element . The nucleus (of all atoms except H) also includes neutrons , which have no electrical charge. Protons and neutrons give atoms their weight, but electrons bond atoms together to make molecules . Electrons are the agents of
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This note was uploaded on 04/07/2008 for the course PHYS 102 taught by Professor Conetti during the Spring '08 term at UVA.

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Lecture06 - 1 LECTURE 6 First we will finish up Chapter 3 -...

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