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Unit 1: The Meaning of Life
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  1. Unit 1: The Meaning of Life Biotic vs. Abiotic (Living) (Nonliving) Alive vs. Dead Organization

  2. Everyone is a Biologist!

  3. Unit 1 The Meaning of Life Every living thing includes the same blueprints: DNA!

  4. Unit 1 The Meaning of Life Chromosomes: The Blueprints of Life

  5. Unit 1 The Meaning of Life Four Questions What are the Necessities of Life? What are the Criteria of Life? What is the Organization of Life? How Diverse is Life?

  6. Unit 1 The Meaning of Life All living things exhibit ten characteristics in combination. What are the Criteria of Life? All of the ten criteria must be met for something to be considered biotic.

  7. Unit 1 The Meaning of Life This organism lives in the ocean depths. How can you tell that it is biotic?

  8. Unit 1 The Meaning of Life The Criteria of Life [See Handout] #1: At least one cell #2: Nutrition #3: Respiration #4: Excretion #5: Regulation #6: Reproduction #7: Growth & Development #8: Adaptation #9: Evolution #10: Organization

  9. Unit 1 The Meaning of Life What are the Criteria of Life?#1: At least one cell • The cell theory, developed in the late 1800’s, states: • All organisms are made of cells. • Cells are the basic unit of structure and function for organisms. • All cells come from pre-existing cells. • A virus is made of a protein coat and DNA or RNA. • Is a virus biotic? • Why/Why not?

  10. Unit 1 The Meaning of Life Energy Use & Metabolism Metabolism - biochemical reactions in the cell that acquire & use energy. AKA: Activities of the cell that require energy. Why do organisms need energy? How do organisms obtain energy? What are the Criteria of Life?#2: Nutrition: Obtaining energy #3: Respiration: Using energy

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

  12. Unit 1 The Meaning of Life What are the Criteria of Life?#4: Excretion: Getting rid of waste or excess • Feces • Urine • CO2 • O2 • H2O

  13. Chapter 1 What is Life? Homeostasis- the ability of an organism to maintain its internal environment despite conditions in the external environment. EX. Human body temperature is regulated. • if body temperature rises, you sweat. • if body temperature lowers, you shiver. What are the Criteria of Life? #5: Regulation:Maintenance of homeostasis

  14. Unit 1 The Meaning of Life 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 Criteria of Life? #6:Reproduction

  15. Unit 1 The Meaning of Life What are the Criteria of Life?#7:Growth & Development • Change in size and structure over the period of a lifetime.

  16. Unit 1 The Meaning of Life Irritability- immediate response to a stimulus. What are the Criteria of Life? #8: Irritability & Adaptation

  17. Unit 1 The Meaning of Life Adaptation- an inherited behavior or characteristic that enables an organism to survive & reproduce. What are the Criteria of Life? #8: Irratability & Adaptation Over time, adaptations are modified bynatural selection.

  18. Unit 1 The Meaning of Life Life is always changing….. …on the level of DNA (mutations) Change = Evolution What are the Criteria of Life? #9: Evolution Evolution is the foundation of biology – everything aspect of biology is connected to it.

  19. Unit 1 The Meaning of Life Every organism fits into an organizational system that spans from everywhere on Earth that life can be found down to the microscopic atoms that make up the organism. What are the Criteria of Life? #10: Organization

  20. Unit 1 The Meaning of Life What is the Organization of Life?

  21. Unit 1 The Meaning of Life ORGAN: a group of tissues that performs a specific function for the organism. TISSUE: a group of cells that performs a specific function for the organism. CELL: the basic unit of organisms. Perform specific functions for the organism. The Organization of Life… continued ORGANELLE: components of cells that perform specific functions for the cell. MOLECULE: combinations of atoms that make up cells. ATOM: the basic unit of matter.

  22. Unit 1 The Meaning of Life Each level of biological organization exhibits emergent properties. The Organization of Life… continued Ex. Capillaries transport blood (property not exhibited by individual endothelial cells).

  23. Unit 1 The Meaning of Life A Short Quiz: 1. What are the criteria 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 Criteria of Life? 4. Why is energy required by living things?

  24. Unit 1 The Meaning of Life Biodiversity refers to the many different types of organisms on earth. Taxonomy is the biological science that classifies life according to evolutionaryrelationships. How is Life Diverse? The Domain is the largest group of organisms.

  25. Unit 1 The Meaning of Life How is Life Diverse?

  26. Unit 1 The Meaning of Life Domain Kingdom Phylum Class Order Family Genus Species How is Life Diverse? Does King Phillip Choose Only Funny Green Socks?

  27. Unit 1 The Meaning of Life Human classification scheme: Domain Eukarya Kingdom Animalia Phylum Chordata Class Mammalia Order Primates Family Hominidae Genus & species Homo sapiens Life is Diverse

  28. Unit 1 The Meaning of Life A Short Quiz: 1. What is the order of classification? 2. Which has more critters: an order or a genus? 3. What is taxonomy? Life is Diverse 4. The scientific name includes the _____ and _____ name.

  29. Unit 1 The Meaning of Life What is the Scientific Method? Methodical exploration How do we study the Natural World? What makes science unique!

  30. Unit 1 The Meaning of Life Observations Question Hypothesis How do we study the Natural World? Prediction Now What???

  31. Observations Question Hypothesis Prediction Unit 1 The Meaning of Life How do we study the Natural World? Experiment

  32. Unit 1 The Meaning of Life How do we study the Natural World?

  33. Unit 1 The Meaning of Life After you perform your experiment, you need to analyze the generated data. Does the data support or not support your hypothesis? How do we study the Natural World? If your data does not support the hypothesis then…… If your data does support your hypothesis……..

  34. Unit 1 The Meaning of Life What is difference between hypothesis, theory & law? Hypothesis - “an educated guess”; a tentative explanation of phenomena. Theory - a widely accepted explanation of natural phenomena; has stood up to thorough & continual testing. Law - a statement of what always occurs under certain conditions. How do we study the Natural World?

  35. Unit 1 The Meaning of Life How is a control group different from an experimental group? What is a double-blind study? How do we study the Natural World?

  36. Unit 1 The Meaning of Life How do we study the Natural World?