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MCQs

Total Questions : 82 | Page 5 of 9 pages
Question 41.  The plasmids can be eliminated from a cell by the process known as
  1.    curing
  2.    breaking
  3.    fixing
  4.    expulsion
 Discuss Question
Answer: Option A. -> curing
Question 42.  Recombination of virus genomes occurs
  1.    by transduction
  2.    by transription
  3.    simultaneous infection of a host cell by two viruses with homologous chromosomes
  4.    by transformation
 Discuss Question
Answer: Option C. -> simultaneous infection of a host cell by two viruses with homologous chromosomes
Question 43.  In the extracellular medium, DNA-degrading enzymes would likely be to prevent transfer of DNA by
  1.    conjugal transfer by a self-transmissible plasmid
  2.    generalized phage transduction
  3.    natural transformation
  4.    none of the above
 Discuss Question
Answer: Option C. -> natural transformation
Question 44.  
What is the term used for a segment of DNA with one or more genes in the centre and the two ends carrying inverted repeat sequences of nucleotides?
  1.    Plasmid
  2.    Transposon
  3.    Insertion sequence
  4.    None of these
 Discuss Question
Answer: Option B. -> Transposon
Question 45.  The type of recombination that commonly occurs between a pair of homologous DNA sequences is,
  1.    mutagenic recombination
  2.    site-specific recombination
  3.    replicative recombination
  4.    general recombination
 Discuss Question
Answer: Option D. -> general recombination
Question 46.  Which of the following statement describes plasmids?
  1.    Another name for a protoplast
  2.    A complex membrane structure that covers the chromosome of bacteria
  3.    Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
  4.    None of the above
 Discuss Question
Answer: Option C. -> Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
Question 47.  
In lysogeny,
  1.    a bacteriophage transfers bacterial DNA
  2.    bacteria take up double stranded DNA from the environmen
  3.    DNA-degrading enzymes in the extracellular medium would stop the process
  4.    a bacteriophage genome is integrated into the bacterial genome
 Discuss Question
Answer: Option D. -> a bacteriophage genome is integrated into the bacterial genome
Question 48. . Which type of plasmid can exist with or without being integrated into the host's chromosome?
  1.    Medisome
  2.    Lisosome
  3.    Lysogen
  4.    Episome
 Discuss Question
Answer: Option D. -> Episome
Question 49. . The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmid
  1.    transfers both strands of the plasmid DNA
  2.    carries genes encoding the mating apparatus
  3.    transfers antibiotic resistance genes
  4.    usually has a transposon inserted into it
 Discuss Question
Answer: Option B. -> carries genes encoding the mating apparatus
Question 50. . The transposase gene encodes an enzyme that facilitate
  1.    viral replication within a genome
  2.    general recombination
  3.    site-specific integration of transposable elements
  4.    none of the above
 Discuss Question
Answer: Option C. -> site-specific integration of transposable elements

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