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NEET MDS Quiz - Practice Test
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Practice Test

General Microbiology - 3 Questions

1
General Microbiology

What is the characteristic odor of cultures of proteus bacilli?

1) Fruity

2) Fishy or seminal

3) Sweet

4) Foul

📝 Explanation:

Proteus bacilli are known for their characteristic swarming motility on agar and a distinctive odor, which is often described as fishy or seminal. This is due to the production of ammonia and indole as metabolic byproducts.

2
General Microbiology

What is the significance of HLA class I antigens in the context of graft rejection and cell mediated cytolysis?
1) They are only involved in cell-to-cell recognition in the immune system.
2) They are the principal antigens that induce an immune response in the host against transplanted tissues.
3) They have no role in graft rejection or cell-mediated immunity.
4) They are only involved in the innate immune response.

📝 Explanation:

HLA class I antigens are the principal antigens that induce an immune response in the host against transplanted tissues.

3
General Microbiology

What is the primary mechanism by which transformation allows horizontal gene transfer in bacteria?
1) By bacterial cells forming a pilus to directly transfer plasmids
2) By viral-mediated transfer of DNA into a bacterium
3) By uptake of naked DNA from the environment and integration into the bacterial genome
4) By replication of plasmid DNA through cell division

📝 Explanation:

transformation is defined as the process where a competent bacterial cell imports free, "naked" DNA molecules from its surrounding extracellular environment. Once inside, this DNA can recombine and integrate directly into the host bacterium's genome.

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