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Cytoplasmic extract from the wild type strain of a bacterium has the ability to convert a colorlesssubstrate (S) to a colored product (P) via three colorless intermediates X Y and Z in that order.Each step of the pathway involves a specic enzyme coded by a distinct gene. Four mutant strains(3 , b', c", d) were isolated. whose extracts are incapable of producrng the colored product in thepresence of S In a series of experiments. extracts from the individual mutants were incubated withX. Y. or Z and scored for color development. The data are summarized in the table below. (Yes:color developed. No: no color developed)CompoundsMutants Based on the data. which one of the following IS the correct order of enzymes involved in thepathway?

  1. d c b a 1 d b cS . X . Y . Z . P S . ( . Y . Z . P
  2. b 1 c d c b d 1
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