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Microbiology

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

Escherichia
None of these
Neisseria
Pseudomonas

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Microbiology
Bacterial spoilage is identified by which of the following morphological characteristics?

Cell aggregation
Endospores
All of these
Encapsulation

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Microbiology
Which of the following can readily kill Salmonellae?

Moist heat at 55°C for 30 min
Moist heat at 55°C for 1 hr
Moist heat at 55°C for 10 min
Moist heat at 55°C for 20 min

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Microbiology
The elimination of the scum of yeasts in the brine during the fermentation include

addition of the sorbic acid
agitation of the surface
addition of the mustard oil
all of these

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Microbiology
Prodigiosin (red pigment) is produced by members of genus

Serratia
Enterobacter
Hafnia
Cirobacter

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Microbiology
Gram-positive bacteria, responsible for food poisoning, is/are

all of these
Clostridia
Pseudomonas
Mycoplasmas

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