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MCQs

Total Questions : 348 | Page 8 of 35 pages
Question 71. False negative Mantoux test is observed in
  1.    early tuberculosis
  2.    Advanced tuberculosis
  3.    Severe malnutrition
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 72. Humans become infected with Mycobacterium tuberculosis most frequently by
  1.    inhalation
  2.    ingestion
  3.    contact
  4.    inoculation
 Discuss Question
Answer: Option A. -> inhalation
Answer: (a).inhalation
Question 73. The bacteria which is microaerophilic on primary isolation, is
  1.    M fortuitum
  2.    Mycobacterium tuberculosis
  3.    M bovis
  4.    none of these
 Discuss Question
Answer: Option C. -> M bovis
Answer: (c).M bovis
Question 74. Which of the following species of Mycobacterium is positive for nitrate reduction test?
  1.    M chelonei
  2.    M fortuitum
  3.    Mycobacterium tuberculosis
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 75. Rough and buff colonies on LJ medium are characteristic of
  1.    M chelonei
  2.    M bovis
  3.    Mycobacterium tuberculosis
  4.    M fortuitum
 Discuss Question
Answer: Option C. -> Mycobacterium tuberculosis
Answer: (c).Mycobacterium tuberculosis
Question 76. Contractile sheath of the tail is present in which of the following phages?
  1.    T3
  2.    T2
  3.    P22
  4.    All of these
 Discuss Question
Answer: Option B. -> T2
Answer: (b).T2
Question 77. __________ protein keeps the prophage dormant and prevents virus reproduction.
  1.    Operator
  2.    Promotor
  3.    Repressor
  4.    Enhancer
 Discuss Question
Answer: Option C. -> Repressor
Answer: (c).Repressor
Question 78. Which of the following bacteria can be typed by phage typing method?
  1.    Staphylococcus aureus
  2.    Salmonella typhi
  3.    Vibrio cholerae
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 79. In viruses with envelopes
  1.    the envelope and the embedded proteins are encoded by the viral nucleic acid
  2.    the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
  3.    the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins
  4.    the envelope and its imbedded proteins are derived from the host's membranes
 Discuss Question
Answer: Option B. -> the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
Answer: (b).the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
Question 80. One of the first enzymes synthesized by many bacteriophage is __________ , an RNA-dependent RNA polymerase.
  1.    RNA transcriptase
  2.    RNA polymerase
  3.    RNA ligase
  4.    RNA replicase
 Discuss Question
Answer: Option D. -> RNA replicase
Answer: (d).RNA replicase

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