Biolog 2 - Chapter 2: Lifes chemical basis A. Atoms Element...

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Chapter 2: Life’s chemical basis A. Atoms Element is a fundamental substance consisting of only one kind of atom Atoms contain protons, neutrons and electrons Mendelev: Periodic table of elements B. Radioisotopes (tracers) Radioactive isotope (radioisotope) spontaneously emits energy in forms of subatomic particles and x-rays Radioactive decay can transform one element to another element Isotope is one of two or more forms of an element’s atoms differ in number of neutrons in the nucleus Tracer is a molecule that incorporates atoms of a radioisotope C. Atoms bonding with atoms Molecule is two or more atoms joined in chemical bond Compounds are two or more elements with bonding Mixtures are two or more elements without bonding D. Biological Molecules Ionic bonding – acquire net charge by gaining or losing electrons (i.e. NaCl) Covalent bonding – share pair of electrons, polar or nonpolar (i.e. H 2 ) Hydrogen bonding – covalent bond (hydrogen bonded to NOF) Compounds – molecules with two or more different elements
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This note was uploaded on 12/03/2011 for the course CHEM BIO P 101 taught by Professor Kk during the Spring '11 term at Rochester.

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Biolog 2 - Chapter 2: Lifes chemical basis A. Atoms Element...

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