36. The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called
A.immunity repressor
B.immunity operon
C.operon repressor
D.none of these

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37. Which of the following virus is susceptible to chloroform?
A.Herpes
B.Influenza
C.Measles
D.All of these

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38. Group E phages have
A.single stranded DNA
B.double stranded DNA
C.single stranded RNA
D.double stranded DNA

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39. The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by
A.the prophage
B.lytic infection by other viruses
C.Both (a) and (b)
D.none of these

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40. The bacterial viruses having head made up of large capsomeres, but no tail is morphologically classified as
A.A
B.B
C.C
D.D

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41. The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as
A.A
B.B
C.C
D.D

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42. Which of the following is not true of virions?
A.Reproduce independently
B.Contain DNA
C.Contain RNA
D.Are extracellular

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