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MCQs

Total Questions : 31 | Page 1 of 4 pages
Question 1. The process by which phage reproduction is initiated in lysogenized culture is called
  1.    repression
  2.    integration
  3.    infection
  4.    induction
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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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