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Fermentation Reactors - Medical Science

Q1:

When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?

A Organism maintaining the highest substrate concentration

B Organism maintaining the lowest substrate concentration

C Both (a) and (b)

D Organism maintaining the moderate substrate concentration

ANS:B - Organism maintaining the lowest substrate concentration

What do you mean by "Organism MAINTAINING the lowest substrate concentration"? Does any organism maintain the substrate concentration in its surround (or may be inside it's belly?) or do you mean organism REQUIRING the lowest substrate concentration?