a. Flavivirus b. Togavirus c. Adenovirus d. Yersinia pestis 36. Temperate phages

Question

a. Flavivirus b. Togavirus c. Adenovirus d. Yersinia pestis 36. Temperate phages often a) lyse their host cell all the time b) integrate their DNA into the host DNA c) change properties of their hosts d) both b and c are correct 37. All phages must have the ability to a) have their nucleic acid enter the host cell b) have their nucleic acid replicate in the host cel c) synthesize RNA molecules d) both a and b are correct 38. The tail fibers on phages are associated with a) penetration b) attachment c) protein translation d) transcription 39. The phages QB and MS2 are a) single stranded RNA lytic phages b) have a large burst size c) Have double stranded DNA d) Both a and b are correct 40. Phage lambda DNA integrates into the E.coli genome at a specific site thr process called b) translation c) transcription d) site specific recombination

Explanation / Answer

36. Temperate phages often change the properties of the host.

Temperate phages can have lysogenic life cycle as well as the lytic lifecycle depending upon the prevailing conditions.

Hence option C is correct.

37. All phages must have the ability to have their nucleic acid enter the host cell and have their nucleic acid replicate in their host cell.

Option D is correct.

38. The tail fibres on the virus are associated with attachment on the host follwed by penetration.

Option B is correct

39. The phages QB and MS2 are single stranded RNA lytic phages.

Option A is correct.

40. Phage lambda DNA integrates into host E.coli genome at a specific site through site specific recombination.

Option D is correct.

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