E-PolyLearning

1. The nucleic scid core of phages is covered by a protein coat known as _______________
a. capsomere
b. capsid
c. outer envelope
d. nuclear membrane
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Answer: (b).capsid

2. The most complex type of bacterial virus has which of the following morphological features?
a. hexagonal head and tail fibres
b. no contractile sheath
c. hexagonal head but no tail
d. hexagonal head,rigid tail with contractile sheath
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Answer: (d).hexagonal head,rigid tail with contractile sheath

3. Which of the following is true for the bacteriophage MV-L2 ?
a. head is made up of large capsomeres
b. head is made up of small capsomeres
c. no contractile sheath is present
d. filamentous form
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Answer: (d).filamentous form

4. Pleomorphic viruses possess double-stranded DNA.
a. True
b. False
c. May be
d. Can't say
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Answer: (a).True

5. What is the shape of helical phages?
a. regular solids
b. polyhedra
c. rod-shaped
d. icosahedral
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Answer: (c).rod-shaped

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