Online Microbiology Test - Microbiology Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Who discovered the bacteria that cause cholera?

Pierre Berthelot

Robert Koch

Louis Pasteur

Rudolf Virchow

[#]

Various bacterial species can be subdivided into

subspecies

biovarieties

serovarieties

all of these

[#]

The Archaea include all of the following except

methanogens

halophiles

thermoacidophiles

cyanobacteria

[#]

Gram staining was developed accidentally in 1884 by

Alexander Fleming

Hans Christian Gram

Joseph Christian Gram

Robert Gram

[#]

What is the action of tetracycline in prokaryotes?

It blocks translocation reaction on ribosomes

It blocks peptidyl transferase reaction on ribosomes

It blocks the binding of amino-acyl tRNA to the A site of ribosomes

Not known with certainity

[#]

Which of the following is used by microbial genetisists as a tool?

Bacteriophage

Plasmids

Transposable elements

All of these

[#]

Which of the following biochemical reaction is characteristic of Pseudomonas aeruginosa?

Production of pyocyanin

Oxidative utilization of glucose

Oxidase production

All of these

[#]

Fungi differ from the other eukaryotic microbes in having

flagella

ergosterol

chloroplasts

an undulating membrane

[#]

Which of the following algal divisions is characterized by possession of chlorophylls A and B, starch as the energy storage material, cellulosic cell walls and live in freshwater and marine habitats?

Chlorophyta

Chrysophyta

Phaeophyta

Pyrrophyta

[#]

10.

Intracytoplasmic inclusion bodies are found in cells infected with

Rabies virus

Vaccinia virus

Fowlpox virus

all of these

[#]

11.

All of the following viruses are enveloped except

Hepatitis A virus

Hepatitis B virus

Hepatitis C virus

Hepatitis D virus

[#]

12.

Which of the following substances can sterilize?

Alcohol

Cetylpyridinium chloride

Ethylene oxide

Chlorine

[#]

13.

Which of the following is most effective for sterilizing mattresses and plastic petri plates?

Chlorine

Ethylene oxide

Glutaraldehyde

Ultraviolet radiation

[#]

14.

All of the following are sporicidal except

glutaraldehyde

ethylene oxide

formaldehyde

alcohol

[#]

15.

All of the following species are considered coliforms except

Enterobacter aerogenes

Klebsiella pneumoniae

Salmonella typhi

Escherichia coli

[#]

16.

Which of the following species can cause bitterness, acidity and curdling in canned milk, cream and evaporated milk?

Bacillus

Clostridium

both (a) and (b)

Saccharomyces

[#]

17.

Coxsackie virus B3, a subgroup of enteroviruses, commonly causes

acute hemorrhagic conjunctivitis

muscular dystrophy

myocarditis

gastroenteritis

[#]

18.

Lactoferrin helps to protect against pathogens by

sequestering Iron

blocking sebum production

lowering the pH

facilitating the growth of normal flora

[#]

19.

Glucoseoxidase, which had been commercially employed to remove glucose from egg white and whole eggs before drying is obtained by submerged aerated fermentation using

A. niger

B. subtilis

B. cereus

A.flavus

[#]

20.

Penicillin was first produced commercially using

stationary mat culture

deep tank aerated fermentations

continuous fermentation

none of the above

[#]

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Online Microbiology Test - Microbiology Test 1

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