Processes of Life in Unicellular Organisms

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Homeostasis

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  • Living organisms keep their internal environment within a certain range (stable internal condition) despite changes in external environment.
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Metabolism

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  • The sum of all the chemical reactions in a cell
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8 Terms

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Homeostasis

  • Living organisms keep their internal environment within a certain range (stable internal condition) despite changes in external environment.
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Metabolism

  • The sum of all the chemical reactions in a cell
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Nutrition

  • Autotrophs: use external energy sources to synthesize carbon compounds from simple inorganic substances
  • Heterotrophs: use carbon compounds obtained from other organisms to synthesize carbon compounds they require
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Movement

  • Sessile: organisms stay in one place
  • Motile: organisms that are mobile
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Excretion

  • process in which metabolic waste is eliminated from an organisms
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Grow and/or Develop

  • Growth: The increase in size and mass of an organism
  • Development: The transformation of the organism through its lifespan (usually involved hormones)
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Response to Stimuli

  • all life can recognize and respond to changes in environmental conditions.
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Reproduction

  • Sexual reproduction: involves two parents and the fusion of haploid sex cells from each parent
  • Asexual: involves only 1 parent