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Everyone is a Biologist !

Everyone is a Biologist ! . Chapter 1 What is Life?. Chapter 1 What is Life?. Chapter 1 What is Life?. Today: Three Questions. How diverse is life?. What are the Characteristics of Life?. How do we study the natural world?.

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Everyone is a Biologist !

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  1. Everyone is a Biologist !

  2. Chapter 1 What is Life?

  3. Chapter 1 What is Life?

  4. Chapter 1 What is Life? Today: Three Questions How diverse is life? What are the Characteristics of Life? How do we study the natural world?

  5. Chapter 1 What is Life? All living things share the following characteristics in combination. What are the Characteristics of Life?

  6. Chapter 1 What is Life? Organization - Made of cells Reproduce Based on universal genetic code Grow and develop Obtain and use materials and energy Respond to their environment Maintain a stable internal environment – metabolism Change over time What are the Characteristics of Life?

  7. Chapter 1 What is Life? MULTICELLULAR ORGANISM ORGAN SYSTEM ORGAN TISSUE What are the Characteristics of Life? CELL ORGANELLE MOLECULE ATOM

  8. Chapter 1 What is Life? What are the Characteristics of Life?

  9. Chapter 1 What is Life? Each level of biological organization exhibits emergent properties. What are the Characteristics of Life? Ex. Capillaries transport blood (property not exhibited by individual endothelial cells).

  10. Chapter 1 What is Life? Energy Use & Metabolism Metabolism- biochemical reactions that acquire & use energy. Why do organisms need energy? How do organisms obtain energy? What are the Characteristics of Life?

  11. Chapter 1 What is Life? What are the Characteristics of Life?

  12. Chapter 1 What is Life? Maintenance of Homeostasis Homeostasis - the ability of an organism to maintain its internal environment despite conditions in the external environment. Human body temperature is……… • if body temperature rises, you sweat. • if body temperature lowers, you shiver. What are the Characteristics of Life?

  13. Chapter 1 What is Life? Reproduction, Growth & Development Asexual reproduction - involves a single parent; progeny are genetically identical to the parent. Sexual reproduction - involves 2 parents; progeny are genetically diverse. Is it essential for an individual to reproduce? What are the Characteristics of Life?

  14. Chapter 1 What is Life? Response & Adaptation Irritability- immediate response to a stimulus. What are the Characteristics of Life?

  15. Chapter 1 What is Life? Irritability & Adaptation Adaptation- an inherited behavior or characteristic that enables an organism to survive & reproduce. What are the Characteristics of Life? Over time, adaptations are modified bynatural selection.

  16. Chapter 1 What is Life? Life is always changing….. On the level of DNA…… Change = Evolution What are the Characteristics of Life? Evolution is the backbone of biology.

  17. Chapter 1 What is Life? A Short Quiz: 1. What are the characteristics of life? 2. What is homeostasis? What is an example of homeostasis? 3. Is a computer living? Why or why not? Is a virus living? What are the Characteristics of Life? 4. Why is energy required by living things?

  18. Chapter 1 What is Life? Biodiversity refers to the many different types of organisms on earth. Taxonomy is the biological science that classifies life according to evolutionary relationships. Life is Diverse The Domain is the largest group of organisms.

  19. Chapter 1 What is Life? Life is Diverse

  20. Chapter 1 What is Life? Kingdom Phylum Class Order Family Genus Species Life is Diverse Kids Pick Candy Over Fancy Green Salads

  21. Francesco Redi’s Experiment Attempting to disprove Spontaneous Generation • Common Beliefs of the Time • Frogs and Turtles come from mud and rotting wood. • Mice come from straw. • Flies come from rotting meat. • Most of these ideas remained from the time of Aristotle. Why would people believe this?

  22. Redi’s Experiment:Step 1 • Redi knew that flies often appeared on and around rotting meat. So, he placed rotting meat in three jars.

  23. Redi’s Experiment:Step 2 • In the first jar, Redi left the jar open to the air.

  24. Redi’s Experiment: Step 3 • On the 2nd jar, Redi placed a cover on the jar. The flies could not smell the meat, nor could they land in the meat.

  25. Redi’s Experiment: Step 4 • On the 3rd jar, Redi placed a gauze or netting over the jar. The flies could smell the meat, but could not land on the meat.

  26. Results? • What would you expect the results of this experiment to be?

  27. Results • In the first jar, the flies could lay their eggs on the rotting meat, maggots would appear and later grow into flies. • In the second jar, the flies could not smell the meat, or land on it, so they would lay their eggs somewhere else. • In the third jar, the flies could smell the meat, so they would lay their eggs on the netting thinking there was a food source for the maggots.

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