The table below presents the ability of four strains of Neurospora crassa that are deficient in tryptophan biosynthesis to grow. on media supplemented with molecules that are biochemical intermediates in the tryptophan synthesis pathway (" " "" = growth, " = no growth). Based on these data, diagram both the biochemical intermediates and genes in the tryptophan biosynthesis pathway. A) What biochemical intermediate immediately precedes tryptophan in the pathway? B) What gene encodes the enzyme that catalyzes the conversion of this intermediate into tryptophan?.