Biology 120 Final - Topic 2 - Cell Structure and Function

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4 Terms

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Elements common to all living things

  • plasma membrane (cell membrane)

  • cytoplasm

  • chromosome

  • ribosome

  • cytoskeleton

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Plasma membrane

A bilayer made of phospholipid molecules with embedded protein molecules that surrounds each cell. Semi-permeable plasma membranes control the flow of substances into and out of a cell.

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Semi-permeable membranes and transportation

Selected substances can penetrate cell membranes through transport protein channels. Selective transport of ions and water-soluble molecules maintains the specialized internal environments required for cellular life. The polarity of a molecule impacts penetration.

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