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MCQs

Total Questions : 46 | Page 3 of 5 pages
Question 21.  Genetic variations are
  1.    temporary
  2.    influenced by the environment
  3.    stable
  4.    not heritable
 Discuss Question
Answer: Option C. -> stable
Question 22.  The mutation which will not affect the length of a protein is,
  1.    nonsense mutation
  2.    missense mutation
  3.    frameshift mutation
  4.    all of these
 Discuss Question
Answer: Option B. -> missense mutation
Question 23.  Changes in which of the following characterizes mutations?
  1.    Phenotype
  2.    Genotype
  3.    Both (a) and (b)
  4.    None of these
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 24.  Which of the following(s) is/are steps in excision repair mechanisms?
  1.    Excision
  2.    Incision
  3.    Ligation
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 25.  The whole-genome shotgun sequencing approach depends primarily on
  1.    rapidly sequencing thousands of small randomly cloned fragments
  2.    methodical sequencing a few large cloned fragments of DNA
  3.    sequencing the bacterial chromosome while it is still intact
  4.    all of the above
 Discuss Question
Answer: Option A. -> rapidly sequencing thousands of small randomly cloned fragments
Question 26.  Which of the following mutations arise without exposure to external agents?
  1.    Spontaneous mutations
  2.    Analogous mutations
  3.    Induced mutations
  4.    None of these
 Discuss Question
Answer: Option A. -> Spontaneous mutations
Question 27.  What was the first eukaryotic chromosome to be sequenced?
  1.    Yeast chromosome III
  2.    Yeast chromosome XI
  3.    Arabidopsis chromosome IV
  4.    None of these
 Discuss Question
Answer: Option A. -> Yeast chromosome III
Question 28.  Due to which of the following DNA repair mechanisms, one is able to distinguish newly synthesized DNA strands from older one?
  1.    New strands do not contain cytosine bases
  2.    New strands are lower in molecular size
  3.    Old strands are methylated while new strands are not
  4.    New strands are methylated while old strands are not
 Discuss Question
Answer: Option C. -> Old strands are methylated while new strands are not
Question 29.  Which of the following bacterial genome was sequenced first?
  1.    E. coli
  2.    S. pneumoniae
  3.    H. influenzae
  4.    S. thermophilus
 Discuss Question
Answer: Option C. -> H. influenzae
Question 30. . A nonsense mutation may result into
  1.    an abnormal elongation of a polypeptide
  2.    a large deletion within the reading frame of a gene
  3.    a premature termination of the synthesis of a polypeptide
  4.    modification of mRNA
 Discuss Question
Answer: Option C. -> a premature termination of the synthesis of a polypeptide

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