Question

Why are the Methyl Red/Voges-Proskauer tests done after 48 hours of incubation?
a) Readings taken at earlier time points may be different from readings taken at 48 hours

b) Bacteria need 48 hours to process all the oxygen in the media

c) Bacteria grow slowly in the MR/VP media

d) K2HPO4 needs 48 hours to react with the acids produced by fermenting  bacteria

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