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Is this biology?. Is this biology?. Is this biology?. Is this biology?. Is this biology?. Is this biology?. Is this biology?. Biology. Defined : the study of life Organism : anything that can carry on the processes of life Species : organisms that can reproduce in breed

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Presentation Transcript
biology
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
slide9

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

slide10

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

slide11

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
slide12

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)
slide13

Life Characteristics

3) Responds to environment

  • Stimulus = environmental factors
    • Ex: Sound, light, touch
slide14

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