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Unformatted text preview: Experiment 1 Cell Theory: All organisms are made up of cells that contain DNA. Gene Theory: DNA sequences may be altered by mutation or by crossing over and by segregation during meiosis. Heredity Theory: Changes in DNA sequences produce individual, heritable variation. Evolution Theory: Changes in DNA produce individuals with favorable traits that have a better chance of survival. Make Observations Formulate Questions o Examine implications Propose hypothesis Test hypothesis Accept/reject hypothesis Modify hypothesis Test modified hypothesis Dependent variable: represents the response to the factor that changes. Independent variable: factor that changes. Controlled variable: Termites Reticulitermes flavipes North American termite Live underground or in decaying wood Sterile and lack compound eyes Workers collect food, feed the queen and other colony members Termites cannot digest wood cellulose without the aid of flagellates that live in their gut. Symbiotic association called mutualism Decomposers of organic material Dissecting microscope: best choice to view larger, three-dimensional, or opaque specimens. Use transmitted and reflected light Compound microscope: Use transmitted light Parfocal Parcentric Experiment 2 Water is a polar molecule Solvent: liquid that does the dissolving Solute: substance being dissolved Solution: solute + solvent Suspension: when solids are dispersed Cohesion: attraction of water molecules to other water molecules.Cohesion: attraction of water molecules to other water molecules....
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This note was uploaded on 05/11/2008 for the course HIST 105-106 taught by Professor Mortenson during the Fall '07 term at Texas A&M.
- Fall '07