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Microbiology

Microbiology
The bacteria which produce(s) β-galactosidase is/are

Enterohacter
all of these
Serratia
Citrobacter

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Microbiology
Which of the following gram-negative bacteria is/are not aerobic?

None of these
Escherichia
Neisseria
Pseudomonas

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Microbiology
Which of the following property(ies), shown by the organisms belong(s) to the family Enterobacteriaceae?

They are oxidase-negative
They ferment glucose
All of these
They are catalase-positive

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Microbiology
Heat-stable enterotoxin of Escherichia coli activates

none of these
adenylate cyclase
both of the above
guanylate cyclase

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Microbiology
Enterobacter can be differentiated from Klebsiella by

none of these
both (a) and (b)
ornithine positivity
motility

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Microbiology
Which of the following genus belongs to family Spirochaetaceae?

All of these
Borrelia
Treponema
Spirochaeta

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