Practice Test 3 Flashcards
- Based on the Bacteriological Analytical Manual (BAM), what is the set valid count range per plate for computing the Colony Forming Units for aerobic plate count?
A. 15-150 colonies
- 10-150 colonies
C. 25-250 colonies
D. 20-250 colonies
C. 25-250 colonies
- Which of the following pathogenic microorganisms is unlikely to cause bloody diarrhea?
A Campylobacter jejuni
- Ecoll 0157:H7
C. Vibrio cholerae
D. Shigella spp.
C. Vibrio cholerae
- The following methods are examples of sterilization by dry heat, EXCEPT
A Flaming
B. Tyndalization
C. Incineration
D. Hot air oven
B. Tyndalization
- What is the primary food safety risk associated with Clostridium perfringens in cooked foods left at
Improper holding temperatures?
A. Enterotoxin production during sporulation
B. Biofilm formation on food contact surfaces
C. Neurotoxin production leading to paralysis
D. Production of Shiga-like toxins
A. Enterotoxin production during sporulation
- Which microorganism is the leading cause of bacterial diarrheal illness in the USA?
A. Noroviruses
B. E. coli 0157:H7
C. Campylobacter jejuni
D. Salmonella Typhi
C. Campylobacter jejuni
- This foodbome parasite is also known as “intestinal roundworm wherein it is most prevalent in regions where pork is consumed raw or undercooked.
A. Taenia saginata
B. Giardia duodenalis
C. Entamoeba histolytica
D. Trichinella spiralis
D. Trichinella spiralis
- What is the required number of sample units selected from a lot of pasteurized milk that must be examined for Listeria monocytogenes?
A. 5
B. 6
C. 10
D. 30
A. 5
- Typical characteristics of S. aureus and S. epidermidis are the following, except for:
A. Both are positive on catalase activity
B. Both are positive on coagulase production
C. Both are positive on lysostaphin sensitivity
D. Both are positive on anaerobic utilization of glucose
B. Both are positive on coagulase production
- Salmonella shows positive result in the following biochemical and serological reactions except on:
A. Polyvalent flagellar test
- Methyl red test
C. Purple color in lysine decarboxylase broth
D. Growth in KCN broth
D. Growth in KCN broth
- How much food sample is used in the MPN-Presumptive test for coliforms, fecal coliforms, and E.coli?
A. 50 g
B. 75 g
C. 100 g
D. 150 g
A. 50 g
