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  • made up of chemicals

  • structure and function

  • interrelated at every level

Atoms & Molecules - Biological function starts at the chemical level

  • example

    • certain atoms come together to form complex molecule chlorophyll

    • many chlorophyll molecules are located in organelles called chloroplasts

    • many chloroplasts are located in cells of photosynthetic tissues in structures (organs) such as leaves of plants

Figure 2.1 The hierarchy of biological order from atom to organism (Biology, 6th Ed., Campbell & Reece)

Atoms & Molecules - Life requires about 25 chemical elements

  • life is composed of matter

  • matter is composed of chemical elements

Atoms & Molecules - Life requires about 25 chemical elements

  • Matter

  • mass – amount of a substance

  • weight – force gravity exerts on substance

Atoms & Molecules - Life requires about 25 chemical elements

  • Matter

  • three states (phases) on earth

    • gas

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