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MCQs

Total Questions : 241 | Page 19 of 25 pages
Question 181. A minor change in sequence of 'base pairs' is called as
  1.    Alternation
  2.    Defects
  3.    Mutations
  4.    Deletions
 Discuss Question
Answer: Option C. -> Mutations
Answer: (c).Mutations
Question 182. Transfer of 'DNA' mediated by bacteriophage is called as
  1.    Transduction
  2.    Transformation
  3.    Conjugations
  4.    Mating
 Discuss Question
Answer: Option A. -> Transduction
Answer: (a).Transduction
Question 183. Site of attachment for 'HIV' virus is
  1.    Acetylcholine receptor
  2.    CD4 proteins on T lymphocytes
  3.    Fibroblast receptor
  4.    Wall receptor
 Discuss Question
Answer: Option B. -> CD4 proteins on T lymphocytes
Answer: (b).CD4 proteins on T lymphocytes
Question 184. In viral 'gene' expression first step is synthesis of
  1.    Messenger RNA
  2.    Transfer RNA
  3.    Ribosomal RNA
  4.    Proteins
 Discuss Question
Answer: Option A. -> Messenger RNA
Answer: (a).Messenger RNA
Question 185. 'replicative cycle' of most of viruses is completed in
  1.    Cytoplasm
  2.    Nucleases
  3.    Nucleus
  4.    Mitochondria
 Discuss Question
Answer: Option A. -> Cytoplasm
Answer: (a).Cytoplasm
Question 186. 'Parvoviruses' composed of
  1.    double-stranded DNA
  2.    RNA
  3.    single-stranded DNA
  4.    double-stranded RNA
 Discuss Question
Answer: Option C. -> single-stranded DNA
Answer: (c).single-stranded DNA
Question 187. A particular family of viruses that is diploid, known as
  1.    Reovirus
  2.    Retrovirus
  3.    HIV
  4.    Poliovirus
 Discuss Question
Answer: Option B. -> Retrovirus
Answer: (b).Retrovirus
Question 188. Poliovirus have single-stranded 'RNA' of
  1.    Negative polarity
  2.    Positive polarity
  3.    Neutral
  4.    Bipolar
 Discuss Question
Answer: Option B. -> Positive polarity
Answer: (b).Positive polarity
Question 189. Enzymes?reverse 'transcriptase' is coded by
  1.    Gag gene
  2.    Pol gene
  3.    Tat gene
  4.    Vif gene
 Discuss Question
Answer: Option B. -> Pol gene
Answer: (b).Pol gene
Question 190. 'Gag' and 'pol' are viral
  1.    Function unit
  2.    Nucleocapsid
  3.    Structural proteins
  4.    Subunits
 Discuss Question
Answer: Option C. -> Structural proteins
Answer: (c).Structural proteins

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