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Microbiology PYQs

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

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Showing 21 questions · Medium · 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} ?

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2

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

MediumBacterial Growth KineticsView answer

3

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

4

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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5

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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6

The term Dysbiosis is associated with:

MediumHuman Microbiome & DysbiosisView answer

7

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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8

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

9

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

10

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

MediumObligate Intracellular ParasitesView answer

11

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

MediumParasitology - LeishmaniasisView answer

12

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

MediumParasitology - Plasmodium Life CycleView answer

13

AIDS is caused by a human retrovirus that kills:

MediumVirology - HIV & AIDSView answer

14

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

MediumVirology - Viral LatencyView answer

15

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

16

Which one of the following is the most accurate statement regarding giardiasis?

MediumParasitology - GiardiasisView answer

17

A bacterial signaling system that regulates population density-dependent gene expression using secreted chemical signals is known as:

MediumQuorum SensingView answer

18

A probiotic is a live microorganism that is claimed to confer a health benefit by altering the indigenous microflora of the intestinal tract. Which one of the following bacteria has been used widely in probiotics?

MediumProbiotics & Gut MicrobiomeView answer

19

Match items in List I with items in List II. [Table] Choose the correct answer from the options given below :

MediumMicrobiology Concepts - Match the FollowingView answer

20

The malarial parasite that has caused recent outbreaks of Monkey malaria in humans is

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