Quiz on Bacteria and Viruses | Microbiology Practice Test

Bacteria are minute and microscopic. They are the simplest organisms. Like fungi most of them are parasites and saprophytes. Some of them are however, autotrophs. There is a good deal of controversy about their taxonomic position in the living world. Bacteria comprise 2500 varieties.
Viruses  have been a highly controversial group of tiny microscopic objects which have been rightly termed the most perfect obligate parasites of the world.  They are absolutely inert outside a living host but once inside the host they are capable of growing, multiplying and undergoing even mutation. They are, therefore, supposed to represent a transitional form of life lying on the border line between the non living and the living world. 
1. Capsid is
Fungal cell wall
The protein coat of viruses
Bacterial cell wall
Virus DNA
2. An anti viral substance which prevents the synthesis of a virus in the cell is known as
3. Major stimulus for spore formation in bacteria is
Cold stress
Heat stress
pH stress
Nutrition limitation
4. Which part of the plant cannot be infected by virus
shoot apex
5. The bacteria multiply by binary fission and requires about
10-40 seconds
20-30 hours
20-30 seconds
20-30 minutes
6. Viruses that persist in the cell and cause recurrent disease are called
Oncogenic viruses
Resistant viruses
Latent viruses
Cytopathic viruses
7. Mycobacterium tuberculosis is an intra cellular bacterium. It prefers to infect
T cells
B cells
8. Which of the following disease caused by by Viroids?
Potato spindle tuber
Early blight of Potato
Potato leaf roll
Wart disease of Potato
9. Which of the following organism is widely used as biocontrol agent in organic farming?
Rhizobium tropici
Fusarium oxysporum
Nostoc muscorum
Trichoderma viridis
10. Who separated the protein coat virus from RNA core by chemical means?
Frankel Conrat
Score =
Correct answers:

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