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january 27 - proton = charge of 1 mass of 1 amu located in...

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January 27, 2009 The Human Body biology = study of life Living organisms share basic characteristics: contain biomolecules = molecules of life = proteins, carbohydrates, lipids, nucleic acids composed of cells prokaryotic eukaryotic = has a nucleus reproduce asexual vs. sexual acquire and use energy and raw materials for maintenance, repair, and growth of their bodies respond to stimuli maintain homeostasis = a nearly constant internal environment ex: body temperature populations evolve and have adaptive traits ex: orchid Life extends from the microscopic to the global scale. It is organized in a hierarchial fashion, from molecule to biosphere. matter = everything that takes up space and has mass all forms of matter are made up of atoms , which are composed of subatomic particles
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Unformatted text preview: proton = charge of +1, mass of 1 amu, located in the nucleus neutron = no charge, mass of 1 amu, located in the nucleus electron = charge of -1, negligible mass, located in the electron cloud amu = atomic mass unit an element = pure form of matter containing only one kind of atom Atoms of the different elements differ in their numbers of subatomic particles. – atomic # = the number of protons in the nucleus; unique for each element Atoms of the same element have the same number of protons, but can differ in number of neutrons. – called isotopes = same atomic #, but different atomic masses (which is protons + neutrons) oxygen (O), carbon (C), hydrogen (H), nitrogen (N) – combined make up over 96% of human body...
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