Four different uracil auxotrophs of Neurospora are tested for growth on uracil and uracil precursors.  The data are shown in the table below.  A plus sign (+) means growth.  Mutant 1 is defective for which enzymatic step?          Compound     A    B    C    D   Uracil  Mutant 1   -   +   -   -      + Mutant 2   -   +   -   +      + Mutant 3   +   +   -   +      + Mutant 4   -   -   -   -      +

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