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1964. 

 See last portion of Supplement V. 



QUESTIONS FOR DISCUSSION 



26.1. Is the hole in the tail of T-even phages large enough for the passage of one 

 or two double helices of DNA? Explain. In what respect does your answer 

 concern the manner in which phage DNA enters into a bacterial host? 



26.2. In studying phages, what are the advantages of using bacteria growing on a 

 solid, rather than in a liquid, culture medium? 



26.3. Do you think it would be feasible to study the genetic basis for different 

 morphological or for different protein components of a phage? Explain. 



26.4. What is meant by a phage cross? Describe how you would know that you 

 made one. 



26.5. Does the finding— that complete progeny phages are liberated after pure DNA 

 from 4>X174 infects a protoplast — mean that all the information for making 

 6X174 DNA and <f>X\14 protein is contained in the phage's DNA? Explain. 



26.6. Are the hypotheses of phage recombination by breakage and by copy-choice 

 mutually exclusive? Explain. 



