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Is this biology?

Is this biology?

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Is this biology?

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  1. Is this biology?

  2. Is this biology?

  3. Is this biology?

  4. Is this biology?

  5. Is this biology?

  6. Is this biology?

  7. Is this biology?

  8. Biology • Defined: the study of life • Organism: anything that can carry on the processes of life • Species: organisms that can reproduce in breed • Over 2 million species • More diverse along equator • Life has been traced to over 3.5 billion years old

  9. Is Fire Alive? • Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment no yes yes no yes yes

  10. Are Cars Alive? yes • Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment no no yes yes yes

  11. Life Characteristics • All life (from bacteria to humans) has a few common characteristics 1) Based from cells • Cell = most basic unit of life • All cells capable of carrying on life processes • Some cells specialized for specific duties • Ex: Red blood cells carry O2

  12. Life Characteristics 2) Requires energy • Energy = ability to do work or cause change • Energy controls metabolism (ability to break down materials) • Most life energy obtained from the sun • Autotrophs: create energy from the sun (ex: plants & algae) • Heterotrophs: consumer others for energy (ex: fungi & animals)

  13. Life Characteristics 3) Responds to environment • Stimulus = environmental factors • Ex: Sound, light, touch

  14. Life Characteristics • 4) Reproduces and develops • Genetic material (DNA) passed to next generation • Asexual reproduction: offspring produced from a single parent • Offspring genetically identical to parent • Sexual reproduction: offspring is a genetic mixture of two parents • Offspring vary genetically from parents

  15. Quick Review • Life on Earth is very diverse • All life has certain features in common • Energy moves from one organism to another