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Microbiology

Microbiology
Soft pickles are made so by pectolytic enzymes mostly from

moulds
none of these
bacteria
yeasts

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Microbiology
Gassy spoilage of green olives is usually caused by

Bacillus spp
all of these
Clostridium spp
Enterobacter spp

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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 are catalase-positive
They ferment glucose
All of these

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Microbiology
Yersinia enterocolitica and Y. pestis can be differentiated on the basis of which of the following tests?

Decarboxylation of ornithine
All of these
Motility at 22°C
Fermentation of sucrose and cellobiose

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Microbiology
The gram-positive bacteria lack __________ structure/component?

teichoic acid
outer membrane
plasma membrane
murein

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Microbiology
The application of Gamma rays destroys botulism toxin. The dose of gamma rays required for this purpose is

73 Rad
173 Rad
73 Gy
7.3 Mrad

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