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Studying Life

Studying Life. Characteristics of Living Things. Many characteristics constitute living Are cars living because the move? Is a fire alive because it is giving off energy?. 8 Characteristics Made up of cells Reproduce Universal genetic code Grow and develop

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Studying Life

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  1. Studying Life

  2. Characteristics of Living Things • Many characteristics constitute living • Are cars living because the move? • Is a fire alive because it is giving off energy?

  3. 8 Characteristics • Made up of cells • Reproduce • Universal genetic code • Grow and develop • Obtain and use materials and energy • Respond to environment • Maintain a stable internal environment • Change over time (as a group) - evolution

  4. True/False Living Things have at least one cell.

  5. Made Up of Cells • Smallest living unit • Can grow, respond, and reproduce • Highly complex • Unicellular – one cell • Multicellular- many-celled • Different types of cells

  6. Reproduction • Asexual – single parent • Cell divides into two • Portion splits off to form new organism

  7. Sexual – two different parents Unite to produce first cell of new organism

  8. True/False Living Things contain genetic information.

  9. Universal Genetic Code • Based on DNA • Determines the traits of every organism

  10. True/False Living Things grow. Living Things grow and develop.

  11. Growth and Development • All organisms grow during at least part of their lives • Eggs –> maggots –> flies = development • Cells become different from one another • Skin, WBC, RBC

  12. True/False Living Things eat. Living Things require an energy source.

  13. Obtain and Use Materials and Energy • Need materials to stay alive • Metabolism • Combination of chemical reactions through which a organism builds up or breaks down materials as it carries on with life • Energy sources • Light, chemicals, animals, plants

  14. True/False Living things move. Living things respond to the environment.

  15. Response to the Environment • Organisms make changes to adjust to environment • Too cold? What does your body do? • What does a cold-blooded animal do? • Light comes from one direction – What does a plant do?

  16. Living Things breath Living Things exchange gases and produce waste.

  17. Maintaining Internal Balance • Homeostasis • Process by which organisms keep stable internal conditions • What do you do when you are thirsty? • What happens when you have a fever?

  18. True/False Living Things change over time (a very long time).

  19. Evolution • Basic traits inherited from parents usually do not change • As a group, over time, any kind of organism can change • Takes Hundreds or thousands of years

  20. Are Viruses Alive? Viruses: Has genetic material Can evolve in response to immune system. Need a host cell to reproduce. Acquire energy from their host cell.

  21. Homework due 8/30 • Explain the main differences between living cells and viruses. Are Viruses alive? Give three supporting details. (see chapter 1 and p. 544)

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