tryptophan is an amino acid broken down by a complex pathway where indole is one of the products formed. the point of the break down process is to...

http://www.genome.jp/kegg-bin/show_pathway?map00380

given the complexity of the pathway shown in the link above, would it make more sense for bacteria to prefer to use glucose or tryptophan for energy?the MR and VP tests are both fermentation tests. explain two specific differences between energy production by aerobic respiration versus by fermentation.

note* these questions pertain to VU Lab 9 from my microbiology study. I do not quite understand the questions clearly.