Discussion
Cumulative conversion of arginine to putrescine by streptococcus spp. and E. coli signifies the following microbial interaction :
Answer: B
The interaction is synergism.
The standard example: Streptococcus faecalis converts arginine to ornithine but cannot go further, and Escherichia coli converts ornithine to putrescine but cannot use arginine. Growing together, the two make putrescine from arginine, which neither can do alone. An interaction in which two populations jointly achieve something neither manages separately, to their mutual benefit, is synergism.
Commensalism benefits only one partner and leaves the other unaffected. Amensalism is the harm of one population by a product of another, such as an antibiotic. Competition is the struggle of two populations for the same limited resource.
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