The Cell: An Overview

Chapter 5

Cell Theory: Fundamental to Life

All organisms are cellular

Cell: the smallest unit of life

Cells come only from preexisting cells

Examples of Cells

Fig. 5-2, p. 92

Animation: Overview of cells

Fig. 5-4a, p. 94Bright field microscopy

Fig. 5-4b, p. 94Dark field microscopy

Plasma Membrane

Fig. 5-6, p. 95

Animation: Cell membranes

Plasma Membrane

Plasma membrane defines cytoplasm

Lipid bilayer and proteins

Hydrophobic• Selective passage hydrophilic

Internal environment of cell different from external

Typical Plant Cell

Fig. 5-9a, p. 100

Electron Micrograph Plant Cell

Fig. 5-9b, p. 100

Microbodies

Fig. 5-17, p. 107

Fig. 5-17, p. 107 (removable labels)

CytosolLargecentralvacuole

Chloroplast

Chloroplast

Cytoskeleton

Cytoskeleton • Maintains shape and organization• Interconnected protein fibers and tubes

Most prominent in animal cells• Plants and fungi also use cell walls and central

vacuole

Cytoskeleton Examples

Fig. 5-18, p. 107

Cell Wall Structure

Fig. 5-25, p. 112

Extracellular Matrix

Fig. 5-27, p. 115

Video: Fluid mosaic model