Microbial Metabolism How would you describe the metabolic pathway of the microorganisms: E. coli, Bacillus subtilis, Pseudomonas and Streptococcus for gelatinase, caseinase and amylase activity? What would the results from those test indicate about the microorganisms metabolic pathways? Results to work with: gelatinase activity: only positive for Bacillus subtilis. caseinase activity: positive for Bacillus subtilis and Pseudomonas amylase activity: only positive for Bacillus subtilis. What do the results indicate about the microorganisms metabolic pathways?.