Practice Quiz

1
Practice Quiz

• Microbes, Food Spoilage, and Food Preservation

2
Directions

• Click anywhere on the screen or hit the down
  arrow to move to the next slide.
• Write each answer on a piece of paper to test
  yourself. Count the number correct.
• Study the ideas and words that you get wrong.
  Good Luck!

3

• Question 1
• Which microbes are most likely to spoil food and
  make us sick?

4

• Answer
• Bacteria

5

• Question 2
• What are the two types of bacteria?

6

• Answer
• Archaebacteria and Eubacteria

7

• Question 3
• What conditions are best for bacterial
  reproduction?

8

• Answer
• A. Nutrients
• B. Moist Environment (Water)
• C. Proper temperature (danger zone)
• D. Proper pH

9

• Question 4
• What is the temperature danger zone that is
  best for bacterial reproduction?

10

• Answer
• 40 to 140 F

11

• Question 5
• What is the pH danger zone that is best for
  bacterial reproduction?

12

• Answer
• pH 4.6 to 10, but pH closest to 7 is best for
  bacteria

13

• Question 6
• What are the 4 Cs to prevent foodborne
  illness?

14

• Answer
• Cook
• Chill
• Clean
• Combat Cross Contamination

15

• Question 7
• What is the range of pH on the pH scale?

16

• Answer
• The pH scale ranges from 0 to 14

17

• Question 8
• What pH is an acid?

18

• Answer
• Any substance with a pH below 7 is an acid.

19

• Question 9
• What is a base?

20

• Answer
• Any substance with a pH above 7 is a base.

21

• Question 10
• What are the two main goals of food preservation?

22

• Answer
• A. Prevent food spoilage
• B. Prevent the growth of pathogens in food

23

• Question 11
• What is a pathogen?

24

• Answer
• A pathogen is a microbe that can cause disease.

25

• Question 12
• What are the three main shapes of bacteria?

26

• Answer
• Bacilli rod-shaped
• Cocci sphere-shaped
• Spirilla spiral-shaped

27

• Question 13
• Where are bacteria normally found in the human
  body?

28

• Answer
• Harmless and helpful bacteria are found in our
  mouths, sinuses, throats, and intestines.

29

• Question 14
• About what percentage of bacteria are pathogens?

30

• Answer
• Approximately 1 of bacteria are pathogens.

31

• Question 15
• How fast can bacteria reproduce in perfect
  conditions?

32

• Answer
• Some bacteria can reproduce every 20 minutes in
  perfect conditions.

33

• Question 16
• What is a flagellum?

34

• Answer
• A flagellum is a whip-like structure on the
  outside of a bacterium. The flagellum helps the
  bacterium move.

35

• Question 17
• List at least two examples of ways in which
  bacteria help us.

36

• Answer
• 1. Bacteria turn milk into yogurt and cheese.
• 2. Bacteria help digest food in our intestines.
• 3. Some bacteria are decomposers.  That is, they
  feed on decaying matter and break it down.

37

• Question 18
• What is Binary fission?

38

• Answer
• Binary fission is the process by which a
  bacterium divides into two cells.  Each cell is
  an exact copy of the original cell.

39

• Question 19
• Why is a bacterium considered to be a prokaryote?

40

• Answer
• A bacterium is considered to be a prokaryote
  because it does not have a nucleus.

41

• Question 20
• Which method of food preservation lowers
  temperatures between 32 F and 40 F ?

42

• Answer
• Refrigeration

43

• Question 21
• Which method of food preservation lowers
  temperatures below 32 F?

44

• Answer
• Freezing

45

• Question 22
• Which method of food preservation uses acid to
  change the food and prevent bacterial
  reproduction ?

46

• Answer
• Fermentation

F
F
47

• Question 23
• Which method of food preservation involves high
  energy which kills microbes ?

48

• Answer
• Irradiation

F
F
49

• Question 24
• Which method of food preservation removes water
  from food to prevent bacterial growth?

50

• Answer
• Dehydration (or drying)

F
F
51

• Question 25
• Which method of food preservation heats food
  (usually liquid) to a high heat for a short time
  to kill most microbes?

52

• Answer
• Pasteurization

F
F
53

• How many did you get correct?
• 23-25 - Awesome! Youre ready - continue your
  review.
• 20-22 - Pretty good. Youre ready, but should
  review a bit more.
• 17-19 - Hmm. You need to study more.
• lt 17 - You really need to study your definitions
  and practice problems.