What kind of virus can integrate its gene in the host cell genome () A .dsDNA virus and +ssRNA virus
A. ssDNA virus and +ssRNA virus
B. dsRNA virus and retrovirus
C. +ssRNA virus and retrovirus
D. dsDNA virus and retrovirus
E. dsDNA virus and +ssRNA virus
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Which of the following is zoonotic bacteria? ()
A. M.Tuberculosis
B. C.perfringens
C. B.anthracis
D. V.Cholera
E. S.Typhi
BCG vaccine is ()
A. human M.tuberculosis treated with formaldehyde
B. human M.tuberculosis treated with heat
C. cattle M.tuberculosis with antigen variation
D. live cattle M.tuberculosis lack virulence and retain antigenicity
E. live huamn M.tuberculosis lack virulence and retain antigenicity
Which disease is caused by rickettsia? ()
A. Syphilis
B. Trachoma
C. lyme disease
D. lymphograuloma venereum
E. scrub typhus
Which one of following structure determines the virus infectivity ()
A. capsomere
B. nucleic acid
C. capsid
D. spikes
E. envelope
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