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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MCB 203

1 / 40

1. Tyndallization is named after

A. John Tyndall

B. Carolus Linnaeus

C. Robert Koch

D. Louis Pasteur

2 / 40

2. Inspissation is mainly used for media containing

A. minerals

B. high protein content

C. antibiotics

D. carbohydrates

3 / 40

3. Filtration is best suited for sterilizing

A. agar plates

B. solid media

C. glassware

D. heat-labile compounds

4 / 40

4. Lactose fermenters on MacConkey agar appear

A. colorless

B. green

C. pink to red

D. yellow

5 / 40

5. Tyndallization is effective because it allows endospores to

A. germinate and be destroyed

B. multiply rapidly

C. remain dormant

D. die immediately

6 / 40

6. Defined media are commonly used to culture

A. fungi only

B. parasites

C. viruses

D. photolithoautotrophs

7 / 40

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

A. Nutrient agar

B. PDA

C. Blood agar

D. MacConkey agar

8 / 40

8. Solid media are especially important because they allow the

A. mutation of organisms

B. rapid growth only

C. destruction of microbes

D. isolation of pure cultures

9 / 40

9. Differential media primarily help to

A. enrich nutrients

B. distinguish groups of microbes

C. kill microbes

D. sterilize cultures

10 / 40

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

A. cost

B. function

C. color

D. origin

11 / 40

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

A. enzymes

B. toxins

C. nutrients

D. antibiotics

12 / 40

12. Agar solidifies at about

A. 75°C

B. 45°C

C. 60°C

D. 90°C

13 / 40

13. Bile salts and crystal violet favor the growth of

A. viruses

B. Gram-positive bacteria

C. fungi

D. Gram-negative bacteria

14 / 40

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

A. mutation

B. isolation and identification

C. transportation

D. destruction

15 / 40

15. Enriched media are prepared by adding substances such as

A. acids

B. dyes

C. blood

D. salts

16 / 40

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

A. nutrients are unknown

B. only natural products are used

C. chemical components are known

D. microbes produce nutrients

17 / 40

17. Blood agar is classified as

A. enriched and differential

B. selective only

C. enriched only

D. differential only

18 / 40

18. Autoclaving is commonly carried out at

A. 100°C for 30 min

B. 121°C at 15 psi for 15 min

C. 85°C for 2 hr

D. 75°C for 10 min

19 / 40

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

A. 0.5

B. 1.0

C. 0.02

D. 0.2

20 / 40

20. Complex media contain ingredients of

A. inorganic salts only

B. known chemical composition

C. pure chemical origin

D. unknown chemical composition

21 / 40

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

A. other relevant information

B. weight

C. traditional

D. price

22 / 40

22. Agar is an excellent solidifying agent because most microorganisms

A. degrade it

B. ferment it

C. consume it

D. cannot degrade it

23 / 40

23. Enrichment culture is mainly used to

A. destroy unwanted microbes

B. isolate organisms of interest

C. preserve microorganisms

D. sterilize samples

24 / 40

24. The most commonly used solidifying agent in microbiology is

A. gelatin

B. starch

C. agar

D. cellulose

25 / 40

25. Copy - Inspissation is mainly used for media containing

A. high protein content

B. antibiotics

C. minerals

D. carbohydrates

26 / 40

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

A. differential culture

B. enrichment culture

C. stock culture

D. pure culture

27 / 40

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

A. agar

B. starch

C. gelatin

D. cellulose

28 / 40

28. The most common method of sterilizing culture media is

A. filtration

B. autoclaving

C. irradiation

D. boiling

29 / 40

29. 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

30 / 40

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

A. minimal

B. unknown

C. simple

D. known

31 / 40

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

A. lactose

B. starch

C. glucose

D. cellulose

32 / 40

32. Tyndallization involves exposure to steam at

A. 121°C

B. 75°C

C. 100°C

D. 90°C

33 / 40

33. Selective media function mainly by

A. encouraging all microbes

B. inhibiting some microbes

C. increasing temperature

D. changing pH

34 / 40

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

A. destroy microorganisms

B. grow, transport, and store microorganisms

C. preserve enzymes

D. identify viruses only

35 / 40

35. Agar melts at approximately

A. 45°C

B. 121°C

C. 90°C

D. 60°C

36 / 40

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

A. differential media

B. supportive (general purpose) media

C. selective media

D. enriched media

37 / 40

37. Fastidious microorganisms are best cultured using

A. defined media

B. complex media

C. selective media only

D. minimal media

38 / 40

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

A. laboratory

B. temperature

C. environment

D. species

39 / 40

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

A. heating

B. weighing

C. sterilization

D. dispensing

40 / 40

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

A. All the options

B. Nutrient broth

C. Blood agar

D. MacConkey agar

Your score is

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MCB 203 CBT PRACTICE

📘 MCB 203 PRACTICE TEST – IMPORTANT INSTRUCTIONS

📝 Test Details

💡 Student Opportunity Hub

⚠️ EXAM STRATEGY & TIPS

📊 GRADING SCALE

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