| key concept5.1Cells Are the Fundamental Units of Life
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| Cell size is limited by the surface area-to-volume ratio
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| Microscopes reveal the features of cells
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| The cell membrane forms an outer boundary of every cell
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| Cells may be classified as either prokaryotic or eukaryotic
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| key concept5.2Prokaryotic Cells Are the Simplest Cells
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| What are the features of prokaryotic cells?
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| Specialized features are found in some prokaryotes
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| key concept5.3Eukaryotic Cells Contain Organelles
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| Compartmentalization is important to eukaryotic cell function
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| Organelles can be studied by microscopy or isolated for chemical analysis
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| Ribosomes are factories for protein synthesis
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| The nucleus contains most of the genetic information
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| The endomembrane system is a group of interrelated organelles
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| Some organelles transform energy
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| There are several other membrane-enclosed organelles
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| The cytoskeleton is important in cell structure and movement
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| Biologists can manipulate living systems to establish cause and effect
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| key concept5.4Extracellular Structures Have Important Roles
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| What is the plant cell wall?
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| The extracellular matrix supports tissue functions in animals
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| key concept5.5Eukaryotic Cells Evolved in Several Steps
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| Internal membranes and the nuclear envelope probably came from the cell membrane
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| Some organelles arose by endosymbiosis
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| Apply What Youâve Learned
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