MILK AND MILK PRODUCTS QUIZ

pink color

black smudge

none of these

greenish areas

worse at the bottom of the milk

worse near the top of the milk

all of these

worse at the middle of the milk

Aeromonas hydrophila

P. mephitica

Pseudomonas synxantha

P. fragi

all of these

P. fragi

Alcaligenes metalcaligenes

Pseudomonas

All of these

thickening caused by micrococci

gas formation by sucrose fermenting yeasts

mold colonies growing on the surface

stringiness caused by mastitis and in particular by fibrin and leucocytes from the cow's blood.

All of these

sliminess resulting from the thickness of the cream

stringiness due to thin films of casein or lactalbumin during cooling

Clostridium sporogenes

Clostridium tyrobutyricum

Clostridium herbarum

None of these

bluish gray to brownish color in milk in its pure form

brownish color to bluish gray in milk in its pure form

yellow color in milk

gray to brownish color in milk

gas forming, aerobic spore formers

gas forming, anaerobic spore formers

both (a) and (b)

none of these

Lactobacillus bulgaricus

mixed culture of (a) and (b)

S. cremoris

Streptococcus thermophilus