Topic

Microbiology PYQs

30 previous year questions across 15 subtopics · answers and explanations included

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One question at a time, instant feedback, score at the end.

Showing 30 questions · page 1 of 2

1

What will be the generation time of a culture with a specific growth rate constant of 0.01 \, \text{min}^{-1} ?

MediumView answer

2

During growth, the diameter of a Staphylococcus bacterial cell increases by 5%. The specific surface area (defined as surface area per unit volume)

HardView answer

3

A growing bacterial culture doubles in 1 hr; the increase in cell mass in 30 minutes will be:

MediumBacterial Growth KineticsView answer

4

A culture contains two bacterial populations 'X' and 'Y' in equal proportion. On dilution plating only two colonies were obtained due to excessive dilution. The probability that one will be X and other will be Y is:

MediumDilution Plating & ProbabilityView answer

5

Bacteria protect themselves from phages by producing the following enzymes which fragment the phage genome

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6

Hepatitis B is caused by a

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7

Which of the following marine phototrophs can utilise carbon-dioxide as the carbon source?

HardView answer

8

A bacterial population, growing in batch culture, increases from 1000 cells to 10,00,000 cells in 5 hours. What is the generation time of the bacteria?

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9

Consider a bacterium that grows with doubling time of 20 min in the exponential phase of its growth cycle and acquire 10 random mutations in its genome in every generation. How many mutations will it acquire after 48 hr of growth in exponential phase?

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10

The term Dysbiosis is associated with:

MediumHuman Microbiome & DysbiosisView answer

11

For a microbial culture, if the doubling time is 0.231 h, the specific growth rate (in h^{-1} ) will be (assume that the endogenous metabolism is negligible)

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12

Given below are two statements: Statement I: MacConkey agar is a media used for recovery of Gram positive bacteria from mixed bacterial culture. Statement II: The bile salts and crystal violet in MacConkey agar inhibit growth of some bacteria. In the light…

MediumSelective & Differential Culture MediaView answer

13

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Mycoplasma is a bacteria without cell wall, and it stains negative in Gram staining. Reason R: Only bacteria that have a cell wall would stain…

MediumBacterial Cell Wall & Gram StainingView answer

14

Which one of the following organisms is NOT an obligate intracellular parasite and, therefore, can grow on bacteriological media?

MediumObligate Intracellular ParasitesView answer

15

Which one of the following statements is most relevant to leishmaniasis?

MediumParasitology - LeishmaniasisView answer

16

Which form of the plasmodia is transmitted from mosquito to human?

MediumParasitology - Plasmodium Life CycleView answer

17

AIDS is caused by a human retrovirus that kills:

MediumVirology - HIV & AIDSView answer

18

Which of the following represents the correct sequence of steps in pathogenesis?

EasyView answer

19

Latency is a characteristic of which one of the following viruses?

MediumVirology - Viral LatencyView answer

20

Which one of the following is the drug of choice for sexually transmitted diseases urethritis and cervicitis caused by Chlamydia trachomatis?

MediumBacteriology - Chlamydia & AntibioticsView answer