Several People from a Picnic Came Down with a Gastrointestinal

question 13

Multiple Choice

Several people from a picnic came down with a gastrointestinal disturbance, and public health officials suspected a case of food poisoning.The food, especially hot dogs, were cultured and after 24 hours of growth on sheep blood agar (SBA) , there was a small, round, smooth, translucent colony surrounded by a narrow zone of b-hemolysis.A Gram stain showed gram-positive coccobacilli.Motility medium was inoculated and an umbrella pattern of motility was observed at room temperature.What organism was isolated as the cause of the illness?

• A)Listeria monocytogenes
• B)Rhodococcus equi
• C)Rothia dentocariosa
• D)Corynebacterium diphtheriae

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Definitions:

Indeterminate Cleavage

Type of cleavage characteristic of deuterostomes; during early cleavage each cell has the potential of developing into a complete embryo. Compare with determinate cleavage.

Deuterostomes

A major lineage of animals characterized by embryonic development where the anus forms before the mouth, including vertebrates and several other phyla.

Protostomes

A group of animals characterized by developing the mouth earlier than the anus during embryonic development, including invertebrates like mollusks and annelids.

Ecdysozoa

A group of protostome animals, including arthropods and nematodes, characterized by periodic shedding of their exoskeletons during growth.