Biology � Test 1 Notes

Biology � Test 1 Notes - Biology Chapter 1 Notes...

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Biology – Chapter 1 Notes Lauren Alford Biology – Studies of life DNA – Inherited information that determines form and function Basic life unit – Composed of one or more cells Science – Collection of unified insights about nature, the evidence for which is an  array of facts Scientific facts – Explanations thought to be true Can disprove theories, cannot fully prove theories (no absolute truths) Scientific Sources: Peer reviewed journals Reviewed text books Science books Science magazines Newspapers / TV Internet Scientific Methods Observation Hypothesis o Hypothesis – Tentative, testable explanation for observed  phenomenon o Theory – Generalization that explains many observations (usually  generates many hypotheses)
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Experiment / Test Conclusion Organization of Life Atoms Molecules Organelles Cells Tissues Organs Organ Systems Organism Population Community Ecosystem Biosphere
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Biology – Chapter 2 Notes Lauren Alford Atom – Basic unit of matter Composed of protons, neutrons, electrons Nucleus – Very little space, but contains nearly all the mass Protons – Positive charge Electrons – Negative charge, little mass Neutrons – No charge # OF PROTONS = # OF ELECTRONS (EXCEPT IN IONS) # OF NEUTRONS VARIES Element – A substance that cannot be broken down to a simpler substance Defined by number of protons in the nucleus (= the atomic number) Composition of Earth 1. Oxygen 2. Silicon 3. Aluminum 4. Iron 5. Calcium Composition of Human Body
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1. Oxygen 2. Carbon 3. Hydrogen 4. Other Isotopes – Forms of a single element that differ in the # of neutrons Radioisotope – Isotope that has an unstable nucleus Radioactive energy – Energy given off when a neutron is lost from an atom Electrons occur in shells and each atom seeks to fill its own shell The 1 st  shell is stable with 2 electrons and all other shells are stable with 8 
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This note was uploaded on 04/07/2008 for the course BIOL 1000 taught by Professor Kearley during the Fall '07 term at Auburn University.

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Biology � Test 1 Notes - Biology Chapter 1 Notes...

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