Section (10 points) (a) Write (italicized) the names (Genus and species) of five

Question

Section (10 points) (a) Write (italicized) the names (Genus and species) of five foodborne human enteric pathogens that can grow at refrigerator temperatures of s5°C. Correct spelling of the names is important. (b) Give the name (Genus) of two groups of bacteria that are a major cause of spoilage in fresh foods (eg vegetables, red meats and poultry meat) stored aerobically at refrigeration temperatures (c) State the names of three toxic oxygen derivatives that are formed in microorganisms that use oxygen metabolically. (d) Select two of the toxic oxygen derivatives (from question I part c) and for each of them write the name of a detoxifying enzyme.

Explanation / Answer

a)

Campylobacter jejuni

Listeria monocytogens

Yersinia enterocolitica

Aeromonas hydrophila

Plesiomonas shigelloids

Pseudomonas aeroginosa

Penicillium spp

Cladosporiun

b)

Listeria monocytogens

Yersinia enterocolitica

c) three toxic oxygen derivatives are

H2O2

OH-

O-2

d) H2O2 is detoxified by catalase enzyme present in peroxisome

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