Question

.Proteus and Escherichia both have the same results for Indole test. a. True b. False

.Proteus and Escherichia both have the same results for Indole test.

a. True

b. False

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Answer #1

The  Indole test is used to determine the ability of an organism to split amino acid tryptophan to form the compound indole. A positive result is shown by the presence of a red or red-violet color in the surface alcohol layer of the broth. A negative result appears yellow. Escherichia give positive results for Indole test, but all the species of proteus doesnot give positive result, (Proteus mirabilis and P. penneri give negative result for indole test ) ANS . FALSE

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