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Microbiology & Immunity: 18 MCQs with Explanations

18 intermediate microbiology & immunity MCQs with answers and explanations for MDCAT, FSc, PPSC preparation.

18
Questions
Intermediate
Difficulty
4
Exams Covered
27
Min Time
Intermediate MDCAT FSc PPSC FPSC
Last updated: Oct 13, 2026
18

Total Practice MCQs

Instant feedback with detailed pedagogical explanations

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Q1 of 18

Which type of immunity is provided by the injection of antibodies?

Q2 of 18

Which of the following is a communicable disease?

Q3 of 18

What is the role of the bacterial capsule, as studied in the prokaryotes section?

Q4 of 18

Which of the following is NOT a method of controlling harmful bacteria, as per the prokaryotes syllabus?

Q5 of 18

The process of conversion of ammonia to nitrites by bacteria is called:

Q6 of 18

The process of conversion of nitrates to nitrogen gas is called:

Q7 of 18

Nitrification refers to bacterial conversion of:

Q8 of 18

Denitrification converts nitrates to:

Q9 of 18

Which organism is a prokaryote?

Q10 of 18

The process of conversion of nitrates to nitrogen gas by bacteria is called:

Q11 of 18

Which microorganism is used in the production of bread?

Q12 of 18

The process of conversion of ammonia to nitrite by bacteria is called:

Q13 of 18

The process of conversion of nitrate to nitrogen gas by bacteria is:

Q14 of 18

Which microorganism is used in the commercial production of bread?

Q15 of 18

The bacterial conversion of ammonia (NH₃) to nitrite (NO₂⁻) is part of:

Q16 of 18

The bacterial conversion of nitrates (NO₃⁻) to nitrogen gas (N₂) under anaerobic conditions is:

Q17 of 18

The process of conversion of nitrite (NO₂⁻) to nitrate (NO₃⁻) is carried out by bacteria called:

Q18 of 18

The process completing nitrogen cycle by converting nitrates to nitrogen gas is:

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