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Biology

Biology . Biology is the Study of LIFE Biology includes the study of life at all levels: biochemical, cellular, organs, organism, populations and ecosystems All Science uses the scientific method to help understand the living and non living world

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Biology

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  1. Biology • Biology is the Study of LIFE • Biology includes the study of life at all levels: biochemical, cellular, organs, organism, populations and ecosystems • All Science uses the scientific method to help understand the living and non living world • Sciences can not be totally studied in isolation (when studying Biology, we will look at: chemistry, geology, astrophysics, and others)

  2. Chemistry of Biology • Four groups of organic molecules in living things (organisms) • Carbohydrates: quick energy (sugars, starches) • Proteins: long chains of amino acids (20) • Lipids: ( fats, cholesterol, earwax) • Nucleic acids: (DNA and RNA)

  3. Characteristics of Living Organisms • Made up of cells (tiny organized structures) • Reproduce on their own (bacteria, plants) • Metabolism (break down foods) • Cellular organization • All living things (organisms) have a Life Cycle

  4. Scientific Method • (an organized way of thinking about things, solving problems and answering questions) • Steps of the Scientific Method: • Observations • Questions • Hypothesis (educated guess) • Predications • Controlled testing • Conclusions

  5. Controlled Testing (experiments) • Groups to be compared • Scientist has good idea of expected results • Control Group – no changes are made • Experimental Group – one change is made • Condition changed is the variable (temp, food, fertilizer given to experimental group) • Hypothesis of test is a possible explanation for the expected results of the experiment. A hypothesis that is not supported is rejected.

  6. Experiment • Control Group no AZT • Experimental Group AZT is given to patients • Variable is AZT • Results: • Living longer is a result of taking AZT therefore: Living Longer is Dependent on AZT (Independent variable)

  7. Safe Laboratory Procedures • Glassware: very hard glass so when it breaks is shatters, wear glasses when using glassware, jagged edges are very sharp on cracked glassware • Flames: not loose clothing, hair should be up, glasses, careful handling, not horse play around flames, use utmost caution • Chemicals: wear glasses, not eating drinking or touching eyes. Treat all chemicals as poisons, clean up spills, wash hands after using, report all problems immediately

  8. Design an Experiment • What is the question? • How will you design an experiment using control and experimental group? • What is the expected results? • Record the results in table as numbers • Make a Graph • Analyze the graph • Make a conclusion

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