CONTENTS 
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58 
The Next Big Leap 
What Are Cells? 
A Fruitful Fusion of Two Techniques 
The Astonishing Uniformity of Life 
The Nucleus, the Cell's "Command Center" 
Ribosomes, the "Protein Factories" 
The Endoplasmic Reticulum 
The Golgi Apparatus, Final Protein Sorter 
Lysosomes and Peroxisomes, the Cell's "Digestive System" 
Mitochondria, Energy Converters in the Cell 
The Cytoskeleton, the Cell's Physical Props 
The Surface Membrane, Versatile Gatekeeper 
Directing Traffic Across the Surface Membrane 
Selective Import, the Job of Receptor Proteins 
A Glimpse of the Future 
Glossary 
