Question 1 Which of the following viruses can lead to immortalizing infection? I. HBV II. HPV III. Chickenpox virus A.II

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Question 1
Which of the following viruses can lead to immortalizing infection?
I. HBV
II. HPV
III. Chickenpox virus
A.II and III only
B.II only
C.I and II only
D.I, II and III
E.I only
Question 2
Which of the following bacterial strains has the highest pathogenicity?
A.Strain B, ID50 = 100 cells
B.Strain C, ID50 = 1,000 cells
C.Strain D, ID50 = 10,000 cells
D.Strain E, ID50 = 100,000 cells
E.Strain A, ID50 = 10 cells
Question 3
13. Rank the following techniques in order of decreasing ability to kill endospores.
I. Dry heating at 100oC
II. Autoclaving
III. Boiling at 100oC
IV. HTST Pasteurization
A.II > I > III > IV
B.I > II > IV > III
C.III > II > I > IV
D.II > III > I > IV
E.IV > III > II > I
Question4
Bleach is not recommended for the disinfection of
A.hands.
B.sewage.
C.laboratory equipment.
D.door handles.
E.chairs.
Question 5
Which of the following statements about viruses is correct?
A.They contain organelles.
B.Their genome is DNA only.
C.They undergo viral replication extracellularly.
D.Their sizes are in the nanometer range.
E.They carry enzymes for energy metabolism.
*Only select one and with explanation