Section 2

Introduction to Cells

• A cell's shape reflects its function.

• Cell size is limited by a cell's surface area-to-volume ratio.

• The three basic parts of a cell are the plasma membrane,

• Prokaryotes are organisms that lack a nucleus or membrane-bound organelles.

• In multicellular eukaryotes, cells organize into tissues, organs, organ systems, and finally organisms.

• Prokaryotes are organisms that lack a nucleus or membrane-bound organelles.

• In multicellular eukaryotes, cells organize into tissues, organs, organ systems, and finally organisms.

Vocabulary plasma membrane (p. 74) cytoplasm (p. 74) cytosol (p. 74)

nucleus (p. 74) prokaryote (p. 75) eukaryote (p. 75)

organ (p. 76)

organ system (p. 76)

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