1. 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

2. The Meaning Of Life What Does it Mean to Be Alive?

3. Characteristics of Life  What does it mean to be alive? -Your thoughts on page 15.

4. Biology:  Bio: Life; living organism  logy: denotes a field of study or academic discipline  Biology: the scientific study of life or living things.

5. 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

6. 1. Cells  Made of one or more cells

7. 2. Universal Genetic Code  DNA or RNA  Information needed to grow, live, reproduce  Passed on to offspring

8. 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

9. 4. Respond to Environment  Detect and respond to stimuli  Stimulus signal to which an organism responds

10. 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

11. 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.

12. 7. Stable Internal Environment  Homeostasis: The ability to maintain stable internal conditions.  Examples:  Body Temperature  Amount of H 2 O in a cell

13. 8. Species Evolve  Over MANY generations groups of organisms evolve (change).  Single organisms DO NOT evolve

14. 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?

15. Virus  A small membrane bound unit with complex molecules that infects cells getting them to reproduce copies of itself.  Is it Alive?

16. 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

17. 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.

18. Yeast Lab Set up: Test tube 1 – Water & sugar Test tube 2 – Water & yeast Test tube 3 – Water, sugar and yeast Observations:

19. 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.