Match the Scientists in Column I with their contribution in the field of virology given in Column II and select your answer from the codes given below:

 

Column I

 

Column II

A.

Pasteur

a.

Gave the name ‘virus’

B.

Ivanowsky  

b.

Recognized tobacco mosaic is caused by microbes smaller than bacteria

C. 

Beijerinck

c.

Demonstrated extract of infected tobacco plants could cause infection in healthy plants

D.

Stanley

d. 

Showed that viruses could be crystallized

Codes:

 

A    

B     

C     

D

1.

a

b

c

d

2.

a

c

b

d

3.

b

a

c

d

4.  

b

a

d

c

Subtopic:  Virus, Viroids & Prions |
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Cells in some filamentous cyanobacteria that are specialized for nitrogen fixation are called:

1. Phycobilisomes

2. Chromatophores

3. Grana

4. Heterocysts

Subtopic:  Kingdom Monera: Blue Green Algae |
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What is true for both (a) and (b)?

1. RNA is the genetic material

2. Capability to infect bacteria

3. Being obligate endoparasites

4.Can be killed by antibiotics

Subtopic:  Virus, Viroids & Prions |
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Which of the following are found in extreme saline conditions?

(1) Archaebacteria

(2) Eubacteria

(3) Cyanobacteria

(4) Mycobacteria

Subtopic:  Kingdom Monera: Bacterial Classification |
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Viroids differ from viruses in having

(1) DNA molecules with protein coat

(2) DNA molecules without protein coat

(3) RNA molecules with protein coat

(4) RNA molecules without protein coat

Subtopic:  Virus, Viroids & Prions |
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Which one of the following is wrong for fungi?

(1) They are eukaryotic

(2) All fungi possess a purely cellulosic cell wall

(3) They are heterotrophic

(4) They are both unicellular and multicellular

Subtopic:  Kingdom Fungi: Introduction |
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Methanogens belong to

(1) eubacteria

(2) archaebacteria

(3) dinoflagellates

(4) slime moulds

Subtopic:  Kingdom Monera: Bacterial Classification |
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Select the wrong statement.

(1) The walls of diatoms are easily destructible

(2) 'Diatomaceous earth' is formed by the cell walls of diatoms

(3) Diatoms are chief producers in the oceans

(4) Diatoms are microscopic and float passively in water

Subtopic:  Kingdom Protista: Chrysophytes |
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Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom

(1) Protista

(2) Fungi

(3) Animalia

(4) Monera

Subtopic:  Kingdom Protista: Introduction |
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The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the

(1) thermoacidophiles

(2) methanogens

(3) eubacteria

(4) halophiles

Subtopic:  Kingdom Monera: Bacterial Classification |
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