Test 6

Question 1

The naturally occuring, antimicrobial, lactoperoxidase system present in raw milk consists of a combination of the lactoperoxidase enzyme, hydrogen peroxide, and what?

Answer 1

thiocyanate

Question 2

Lactoferrin is a compound found in raw milk that owes its antimicorbial properties to its ability to:

Answer 2

bind with iron

Question 3

The antimicrobial properties of spices are typically due to the phenolic properties of:

Answer 3

essential oils

Question 4

The antimicrobial, carvacrol, which is present in oregano, is structurally very simliar to this compound?

Answer 4

thymol

Question 5

The antimicrobial compound, diallyl thiosulfinate, present in garlic after bulbs are “injured,” is also known as:

Answer 5

allicin

Question 6

Benzoic acid is naturally found in:

Answer 6

cranberries

Question 7

Shrimp shells, mushrooms, and molds are partially composed of what antimicrobial compound?

Answer 7

chitosan

Question 8

This classification of microorganisms is known to grow well at freezing temperatures?

Answer 8

psychrophiles

Question 9

WHich of the following foodborne pathogens is recognized for its ability to grow at refrgeration temperatures?

a. Samonella Refrigerosa
b. Listeria monocytogenes
c. Lactobacillus psychrophilicum

Answer 9

Listeria monocytogenes

Question 10

Increased paolsaccharide production by psychrotrophs in milk produce a spoilage problem know as:

Answer 10

rope formation

Question 11

Clostridium botulinum Type E is associated primarily with what food product?

Answer 11

fish

Question 12

Thermophilic bacteria are typically:

Answer 12

sporeformers

Question 13

Ground beef that is pruchased from Wal-Mart is packed in plastic tray overlayed with:

Answer 13

bilayer film

Question 14

This form of organic acid has greater antimicrobial properties

Answer 14

undissociated

Question 15

This yeast is known for its resistance to benzoic acid.

Answer 15

Zygosaccaromyces bailii

Question 16

This antimicrobial compound, also used as a flavoring agent, is recognized for its capability as a mold and rope inhibitor.

Answer 16

sodium diacetate

Question 17

Which organic acids is specifically used in bread because of its abilit to inhibit molds and bacteria, but not yeasts?

Answer 17

propionic acid

Question 18

The holes in Swiss chees are produces/caused by:

Answer 18

bacteria

Question 19

Sorbic acid was first isolated from?

Answer 19

rowanberries

Question 20

This organism is resistant to benzoic acid and sorbic acid:

Answer 20

Zygosaccharomyces bailii