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Characteristics of Life

This overview details the essential characteristics that define living organisms. It covers fundamental concepts such as metabolism, reproduction (asexual and sexual), and the ability to respond to stimuli. The process of evolution and the significance of development from egg to adult are explored. We examine the differences between prokaryotic and eukaryotic cells, as well as unique features of plant and animal cells. Key topics also include homeostasis, growth, and the levels of organization from atoms to ecosystems, providing a comprehensive understanding of life.

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Characteristics of Life

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  1. Characteristics of Life Is it ALIVE?

  2. Metabolism • All orgs… • Take in Energy for nourishment • Convert E to useable forms • Expel E in waste

  3. Reproduction Method to keep species alive Asexual & Sexual

  4. Respond to Stimulus • Orgs must respond to internal and external stimuli

  5. Evolution • Populations of orgs change their genetic make-up over many generations and adapt to surroundings

  6. Development • Egg to mature adult

  7. Cells • Prokaryotic cells do not have a membrane bound nucleus, eukaryotic cells do.

  8. Cells Plant cells have cell walls, animal cells don’t

  9. Homeostasis • Orgs must regulate their internal environment

  10. Energy Autotrophs Heterotrophs

  11. Growth • All orgs grow in size

  12. MRS ED CHEG • Metabolism • Response to Stimulus • Reproduction • Energy • Development • Cells • Homeostasis • Evolution • Growth

  13. Levels of Organization Atom: Oxygen

  14. Levels of Organization Molecule: DNA

  15. Levels of Organization Organelle: Nucleus Tissue: Ciliated Epithelial Tissue Cell: Goblet Cell

  16. Levels of Organization Organ: Trachea Organ System: Respiratory

  17. Levels of Organization Organism: Sheep Community Different species interacting in a common environment Population: Group of org’s of one species Ecosystem A community and its interactions with the non-living environment

  18. What is the purpose of reproduction? • What are 2 types of reproduction? • Define Evolution • Give an example of something that has evolved. • What is the difference between growth & development? • Give an example of how a person can develop and grow. • Define homeostasis. • Give two example of homeostasis.

  19. Give examples of the levels of organization from atom to organism. • Define metabolism. • Explain how metabolism is related to energy and development. • Explain how responding to stimuli can help an organism. • What is one thing that is different between plant and animal cells? • What is the difference between a eukaryotic and prokaryotic cell?

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