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Monday, September 23, 2013 LT: Explain the characteristics of living things EW: I believe that crystals are alive because they grow spontaneously, forming complex structures and are often found in large groups of the same type, but of different ages. Do you agree or disagree? Why? Today: Check Procedure Take data Meaning of Life discussion Characteristics of Life WS
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The Meaning Of Life What Does it Mean to Be Alive?
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Characteristics of Life What does it mean to be alive? -Your thoughts on page 15.
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Biology: Bio: Life; living organism logy: denotes a field of study or academic discipline Biology: the scientific study of life or living things.
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Eight Characteristics of Life Living things have these characteristics in common. These are a checklist to determine if something is (or was) alive CAREFUL: Some dependent upon stage of life
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1. Cells Made of one or more cells
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2. Universal Genetic Code DNA or RNA Information needed to grow, live, reproduce Passed on to offspring
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3. Grow and Develop Growth: To get bigger How do organisms get bigger? Cells multiply (the cells themselves don’t enlarge) Develop: To change and get more complex Cells differentiate Cells have different jobs Ex. Muscle cells, bone cells
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4. Respond to Environment Detect and respond to stimuli Stimulus signal to which an organism responds
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5. Reproduction Reproduction: The continuation of a species through the passing on of genetic material to a new generation (Cellular Division counts, too). New, similar organisms
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6. Obtain and Use Material and Energy Material and energy needed to grow, develop and reproduce. Metabolism: Chemical reactions that builds up or breaks down materials.
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7. Stable Internal Environment Homeostasis: The ability to maintain stable internal conditions. Examples: Body Temperature Amount of H 2 O in a cell
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8. Species Evolve Over MANY generations groups of organisms evolve (change). Single organisms DO NOT evolve
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Fire It uses energy, it grows, it must maintain a constant temperature, it can create new fires that are similar in complexity and behavior. Is it Alive?
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Virus A small membrane bound unit with complex molecules that infects cells getting them to reproduce copies of itself. Is it Alive?
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Tuesday, September 24, 2013 LT: I can explain the characteristics of living things. EW: What gas do you breathe in? What waste gas do you exhale? Which characteristic of life is exhibited by this exchange? Today: Mini – lab as a class Characteristics of Life WS
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Is Yeast Alive? 1 What do you think? How would you know? 2 Bromthymol Blue Test – When bromthymol blue changes from blue to yellow it indicates the presence of ________________. 3 What would the production of CO2 indicate about yeast? Explain your answer.
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Yeast Lab Set up: Test tube 1 – Water & sugar Test tube 2 – Water & yeast Test tube 3 – Water, sugar and yeast Observations:
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Analysis: Was there CO 2 produced by the yeast and how do you know (cite your evidence)? Did you find any other evidence to suggest that yeast is alive? What is it and how does it show that yeast is living? (Hint: there are at least 4 more qualities you can talk about here.) Did the control tubes support your conclusion about yeast being alive? Explain why or why not.
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