FINAL EXAM

Question 1

difference between black oncom and red oncom

Answer 1

microbes and medium (a and b)

Question 2

the reaction to check the presence of catalase activity

Answer 2

bubbles formation and solution H2O2
(a and b)

Question 3

the medium used for the MPN method

Answer 3

• lactose broth
• potatoes dextrose agar
• tryptone glucose yeast extract agar
  (a,b,c)

Question 4

in beer production, the one contributing in producing flavor

Answer 4

biochemical reaction and ester formed (a and b)

Question 5

hepatitis A virus have characteristics

Answer 5

• killed with heating
• avoided by immunization
• infected liver
  (a,b,c)

Question 6

chemical preservatives can be derived from

Answer 6

• fermentation process
• naturally presentation in material
• synthetic chemical that is added
  (a,b,c)

Question 7

bacteria belongs in acetic acid bacteria

Answer 7

acetobacter xylinum and gluconobacter
(a and b)

Question 8

the advantage of the CCM method

Answer 8

the results illustrate the viable cells in the sample

Question 9

which one is true

Answer 9

yeast without oxygen produces 2 mole ethanol, 2 mole CO2, and 2 ATP from 1 mole glucose

Question 10

reaction in the presence of lipase can be aware with

Answer 10

reaction products provide fatty acid and glycerol

Question 11

the amount of microbe in milk that just milked 104 CFU/ml. This means

Answer 11

all wrong

Question 12

microbial endurance to heat

Answer 12

spore more resistant than vegetative

Question 13

pasteurization of milk can be done to kill microbes by

Answer 13

LTLT, HTST,UHT (a,b,c)

Question 14

botulinum toxin have the following characteristics

Answer 14

• not resistant to heat and very toxic
• produced if there’s anaerobic condition
• attack nervous system and can cause paralysis

Question 15

difference between salmonella and shigella (lactose fermentation)

Answer 15

• salmonela motile, shigella not
• salmonella produces H2S, shigella not
• salmonella has short onset time, shigella longer

Question 16

mycotoxin that can cause problem in apple juice

Answer 16

patulin

Question 17

which is known as machine mold

Answer 17

geotrichum candidum

Question 18

clostridium (campylobacter) jejuni belongs to pathogen that

Answer 18

• contaminate drinking water a lot
• can cause bloody diarrhea
• microaerophilic

Question 19

treatments that kills microbes is/are

Answer 19

sterilization and irradiation

Question 20

bread spoiler mold so cause black spots appear due to mold

Answer 20

R.stolonifer

Question 21

hydrolysis because of the presence proteolytic (bacteria) enzyme can cause

Answer 21

rotten smell and bitter taste (a and b)

Question 22

norwalk-like virus is a virus that

Answer 22

cause pain on gastrointestinal track

Question 23

toxin that can cause st.anthony’s fire symptom

Answer 23

ergotoxin

Question 24

bioactive component of this spice is correct

Answer 24

• piperin of pepper
• alicin of garlic
• acetoxychavicol acetate

Question 25

the following is not in 100% sterile condition

Answer 25

• raw material
• processed food
• canned food

Question 26

the most sensitive phase for microbes to heat

Answer 26

log phase

Question 27

HTST is the process of heating on

Answer 27

temperature 72 celcius for 15 seconds

Question 28

the effect and its appropriate preservatives

Answer 28

sulfur also acts as an antioxidant and anti-browning

Question 29

toxin produced by S.aureus

Answer 29

enterotoxin

Question 30

toxin produced by penicillium

Answer 30

ochratoxin