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MCQs

Total Questions : 31 | Page 3 of 4 pages
Question 21.  
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
Question 22.  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
Question 23.  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
Question 24. . 
__________ protein keeps the prophage dormant and prevents virus reproduction.
  1.    Operator
  2.    Promotor
  3.    Repressor
  4.    Enhancer
 Discuss Question
Answer: Option C. -> Repressor
Question 25.  
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
Question 26. . T-even phage binding to E. coli probably involves
  1.    electrostatic interaction
  2.    hydrophobic interaction
  3.    covalent bonds
  4.    all of these
 Discuss Question
Answer: Option A. -> electrostatic interaction
Question 27. . Which of the following properties is due to lysogenic conversion by phages?
  1.    Toxin production in Corynebacterium diphtheriae
  2.    Toxin production in Clostridium botulinum types C and D
  3.    Antigenic variation in Salmonella anatum
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 28. . The filamentous bacteriopohage infect male E. coli cells by attaching to
  1.    lipopolysaccharide
  2.    the cell wall
  3.    the tip of the pilus
  4.    the cell membrane
 Discuss Question
Answer: Option C. -> the tip of the pilus
Question 29. . 
__________ is specifically able to have a long-term relationship with the host known as lysogeny.
  1.    Temperate virus
  2.    Adsorbed virus
  3.    RNA phage
  4.    DNA phage
 Discuss Question
Answer: Option A. -> Temperate virus
Question 30. . A bacterial defense mechanism against bacteriophage is called
  1.    concatamerization
  2.    polymerization
  3.    restriction
  4.    lysogeny
 Discuss Question
Answer: Option C. -> restriction

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