MCB 203 CBT PRACTICE

Table of Contents

📘 MCB 203 PRACTICE TEST – IMPORTANT INSTRUCTIONS

Take your time to read the instructions carefully before starting this test.

📝 Test Details

Total Questions: 40

Time Allowed: 15 minutes

This gives you very few seconds per question, so manage your time wisely.

✅ If you can score at least 60%, you can be rest assured that you’ll ace MCB 203 in the real exam.

PS:

In the actual exam, you’ll likely be asked between 40 – 60 questions.

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⚠️ EXAM STRATEGY & TIPS

Do not rush into answering questions.
Don’t waste too much time on questions you don’t know — skip and move on.
Start with questions that don’t involve calculations to save time.
Always crosscheck your answers.
Don’t be in a hurry to submit — you’re not in a competition.
Don’t be scared — getting an A is very achievable.
Don’t be overconfident either — calm your blood, no be only you sabi book 😌.
If you have any complaints, corrections, or feedback, please use the comment box.

📊 GRADING SCALE

70 – 100 → A

60 – 69 → B

50 – 59 → C

45 – 49 → D

40 – 44 → E

0 – 39 → F

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Pos.	Name	Score	Duration
1	OyinStubborn	81.5 %	6 minutes 11 seconds
2	Emesiani Stephanie	59 %	6 minutes 6 seconds
3	Olakunle Olumide Emmanuel	0 %	9 seconds

MCB 203

1 / 40

1. A culture obtained by favoring the growth of a specific microorganism from a mixed sample is called

A. enrichment culture

B. differential culture

C. pure culture

D. stock culture

2 / 40

2. Filtration is best suited for sterilizing

A. glassware

B. heat-labile compounds

C. solid media

D. agar plates

3 / 40

3. Agar melts at approximately

A. 90°C

B. 60°C

C. 45°C

D. 121°C

4 / 40

4. Selective media function mainly by

A. increasing temperature

B. encouraging all microbes

C. changing pH

D. inhibiting some microbes

5 / 40

5. A defined (synthetic) medium is one in which

A. microbes produce nutrients

B. only natural products are used

C. chemical components are known

D. nutrients are unknown

6 / 40

6. Enriched media are prepared by adding substances such as

A. acids

B. salts

C. dyes

D. blood

7 / 40

7. Agar solidifies at about

A. 45°C

B. 90°C

C. 60°C

D. 75°C

8 / 40

8. Which medium is commonly used to detect E. coli?

A. PDA

B. Nutrient agar

C. MacConkey agar

D. Blood agar

9 / 40

9. Solid media are especially important because they allow the

A. rapid growth only

B. isolation of pure cultures

C. destruction of microbes

D. mutation of organisms

10 / 40

10. Defined media can exist in liquid form or be solidified using

A. gelatin

B. agar

C. cellulose

D. starch

11 / 40

11. Copy - Inspissation is mainly used for media containing

A. carbohydrates

B. antibiotics

C. minerals

D. high protein content

12 / 40

12. Tyndallization involves exposure to steam at

A. 100°C

B. 75°C

C. 90°C

D. 121°C

13 / 40

13. For a culture medium to be effective, it must contain all the ________ required for microbial growth.

A. toxins

B. antibiotics

C. nutrients

D. enzymes

14 / 40

14. Autoclaving is commonly carried out at

A. 85°C for 2 hr

B. 121°C at 15 psi for 15 min

C. 100°C for 30 min

D. 75°C for 10 min

15 / 40

15. Specialized media are particularly important in the ________ of microorganisms.

A. mutation

B. destruction

C. isolation and identification

D. transportation

16 / 40

16. Complex media contain ingredients of

A. known chemical composition

B. pure chemical origin

C. unknown chemical composition

D. inorganic salts only

17 / 40

17. The most commonly used solidifying agent in microbiology is

A. cellulose

B. starch

C. gelatin

D. agar

18 / 40

18. Which of the following is an example of a complex medium?

A. MacConkey agar

B. All the options

C. Blood agar

D. Nutrient broth

19 / 40

19. The exact composition of a satisfactory medium depends on the ________ being cultivated.

A. temperature

B. environment

C. laboratory

D. species

20 / 40

20. Media that support the growth of many microorganisms are called

A. differential media

B. supportive (general purpose) media

C. selective media

D. enriched media

21 / 40

21. Differential media primarily help to

A. kill microbes

B. enrich nutrients

C. sterilize cultures

D. distinguish groups of microbes

22 / 40

22. A membrane filter with a pore size of ________ µm is commonly used to remove bacteria.

A. 0.02

B. 0.5

C. 0.2

D. 1.0

23 / 40

23. MacConkey agar is both selective and differential because it contains

A. glucose and agar

B. cellulose and dye

C. lactose and neutral red

D. blood and salt

24 / 40

24. Tyndallization is named after

A. Louis Pasteur

B. Robert Koch

C. Carolus Linnaeus

D. John Tyndall

25 / 40

25. Tyndallization is effective because it allows endospores to

A. die immediately

B. germinate and be destroyed

C. multiply rapidly

D. remain dormant

26 / 40

26. Blood agar is classified as

A. enriched only

B. selective only

C. differential only

D. enriched and differential

27 / 40

27. After autoclaving, media should be allowed to cool before

A. heating

B. dispensing

C. weighing

D. sterilization

28 / 40

28. Complex media are preferred when the nutritional requirements of a microorganism are

A. minimal

B. simple

C. known

D. unknown

29 / 40

29. The most common method of sterilizing culture media is

A. boiling

B. filtration

C. autoclaving

D. irradiation

30 / 40

30. Culture media can be classified based on chemical composition, physical nature, and

A. cost

B. function

C. color

D. origin

31 / 40

31. Lactose fermenters on MacConkey agar appear

A. green

B. colorless

C. pink to red

D. yellow

32 / 40

32. A carbon source commonly used in defined media for chemoorganoheterotrophs is

A. glucose

B. lactose

C. cellulose

D. starch

33 / 40

33. Bile salts and crystal violet favor the growth of

A. Gram-positive bacteria

B. viruses

C. fungi

D. Gram-negative bacteria

34 / 40

34. Defined media are commonly used to culture

A. parasites

B. photolithoautotrophs

C. viruses

D. fungi only

35 / 40

35. Agar is an excellent solidifying agent because most microorganisms

A. ferment it

B. consume it

C. cannot degrade it

D. degrade it

36 / 40

36. Enrichment culture is mainly used to

A. sterilize samples

B. preserve microorganisms

C. isolate organisms of interest

D. destroy unwanted microbes

37 / 40

37. Properly prepared media containers should be labeled with date, media type, and

A. price

B. traditional

C. weight

D. other relevant information

38 / 40

38. Fastidious microorganisms are best cultured using

A. minimal media

B. selective media only

C. defined media

D. complex media

39 / 40

39. A culture medium is best defined as a preparation used to

A. destroy microorganisms

B. preserve enzymes

C. grow, transport, and store microorganisms

D. identify viruses only

40 / 40

40. Inspissation is mainly used for media containing

A. carbohydrates

B. antibiotics

C. high protein content

D. minerals

Your score is

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MCB 203 CBT PRACTICE

📘 MCB 203 PRACTICE TEST – IMPORTANT INSTRUCTIONS

📝 Test Details

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⚠️ EXAM STRATEGY & TIPS

📊 GRADING SCALE

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