f. I 



Contents 



Preface v 



List of Contributors xi 



/ — Molecules, Viruses, and Bacteria 



1. Macromolecules and Natural Selection 



Francis H. C. Crick ' 3 



2. The Synthesis of Proteins 



Mahlon B. IloagJand 9 



3. \'irus-Induced Acquisition of Metabolic Function 



Seymour S. Cohen 17 



4. Recombination Analysis in Microbial Systems 



Harriett Ephrussi-TayJor 39 



5. The Role of Enzyme Regulation in Metabolism 



Arthur B. Pardee 77 



6. Bacteria with High Levels of Specific Enzymes 



Aaron Novick 93 



7. The Formation of Spores by Bacteria 



//. Orin Ilalvorson 107 



7/ — Cells, Tissues, and Organisms 



8. S\nchronized Growth in Tetrahymena Cells 



Erik Zeuthen 135 



9. The Plan of Cellular Reproduction 



Daniel Mazia 159 



10. Mammalian Cell Growtli in Tissue Culture 



Theodore T. Fuck • 181 



xni 



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