The first two questions refer to the following data A series of 5 auxotrophic the synthesis of a product called pr7 These are

Question

The first two questions refer to the following data A series of 5 auxotrophic the synthesis of a product called pr7 These are used to determine the biochemical pathway by which the cells make pr7 Minimal medium is supplemented with each of the following molecules and the ability of the cells to grow or not grow is determined Intermediate molecules in the pathway are given letters the genes coding for enzymes for each step are identified by the numbers of the respective mutant strain Strain 2 3 4 5 minimal medium min min D 11 1 min H 1111 min R 0 0 0 O min E 1 1 min pr7 O a HDER b EDHR c DHRE d RED H e none of the above 1 What is the order of intermediate molecules in this pathway the letters that would occur in the circled steps end product pr7 2 Which gene codes for the enzyme that is earliest in the pathway the enzyme catalyzing the step marked with a circle below a 1 b 2 c 3 d 4 e 5 end product pr7

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