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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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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


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


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


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


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)


Life Characteristics

3) Responds to environment

  • Stimulus = environmental factors

    • Ex: Sound, light, touch


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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