Bacteriophages(Microbiology ) Questions and Answers

Question 1. The process by which phage reproduction is initiated in lysogenized culture is called
  1.    repression
  2.    integration
  3.    infection
  4.    induction
Explanation:-
Answer: Option D. -> induction
Question 2. Area of lysis on a bacterial lawn culture produced by a phage is known as
  1.    plaque
  2.    pock
  3.    pox
  4.    all of these
Explanation:-
Answer: Option A. -> plaque
Question 3. Which capsid symmetry is exhibited by most of the phages?
  1.    Icosahedral
  2.    Complex
  3.    None of these
  4.    Helical
Explanation:-
Answer: Option A. -> Icosahedral
Question 4. Which of the following is/are synthesized from late mRNA?
  1.    Phage structural proteins
  2.    All of these
  3.    Proteins involved in cell lysis and phage release
  4.    Proteins that help with phage assembly without becoming part of the virion structure
Explanation:-
Answer: Option B. -> All of these
Question 5. The procapsid is assembled with the aid of __________ proteins.
  1.    ladder
  2.    framing
  3.    form
  4.    scaffolding
Explanation:-
Answer: Option D. -> scaffolding
Question 6. One of the first enzymes synthesized by many bacteriophage is __________ , an RNA-dependent RNA polymerase.
  1.    RNA polymerase
  2.    RNA replicase
  3.    RNA ligase
  4.    RNA transcriptase
Explanation:-
Answer: Option B. -> RNA replicase
Question 7. Contractile sheath of the tail is present in which of the following phages?
  1.    T2
  2.    P22
  3.    T3
  4.    All of these
Explanation:-
Answer: Option A. -> T2
Question 8. Which of the following bacteria can be typed by phage typing method?
  1.    Vibrio cholerae
  2.    Staphylococcus aureus
  3.    All of these
  4.    Salmonella typhi
Explanation:-
Answer: Option C. -> All of these
Question 9. __________ protein keeps the prophage dormant and prevents virus reproduction.
  1.    Repressor
  2.    Enhancer
  3.    Promotor
  4.    Operator
Explanation:-
Answer: Option A. -> Repressor
Question 10. 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 and its imbedded proteins are derived from the host's membranes
  4.    the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins
Explanation:-
Answer: Option B. -> the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid
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