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Total Questions : 241 | Page 3 of 25 pages
Question 21. The synthesis of mRNA based on a DNA template is called
  1.    DNA replication
  2.    transcription
  3.    translation
  4.    DNA restriction
 Discuss Question
Answer: Option B. -> transcription
Answer: (b).transcription
Question 22. Recognition/binding site of RNA polymerase is called
  1.    receptor
  2.    promoter
  3.    facilitator
  4.    terminator
 Discuss Question
Answer: Option B. -> promoter
Answer: (b).promoter
Question 23. The location of first hexameric sequence typically found in pro-karyotic promoters is
  1.    at the transcription start site
  2.    approximately 35 bases upstream of the transcription start site
  3.    approximately 10 bases upstream of the transcription start site
  4.    approximately 25 bases upstream of the transcription start site
 Discuss Question
Answer: Option B. -> approximately 35 bases upstream of the transcription start site
Answer: (b).approximately 35 bases upstream of the transcription start site
Question 24. Which of the following is a product of transcription?
  1.    mRNA
  2.    tRNA
  3.    rRNA
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 25. The sigma factor
  1.    is responsible for recognizing the termination sequence
  2.    provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis
  3.    recognizes the promotor
  4.    accomplishes DNA restriction
 Discuss Question
Answer: Option C. -> recognizes the promotor
Answer: (c).recognizes the promotor
Question 26. 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
Answer: (c).H. influenzae
Question 27. Which of the following mutation affects only a single nucleotide?
  1.    Aerial mutation
  2.    Site mutation
  3.    Point mutation
  4.    Regional mutation
 Discuss Question
Answer: Option C. -> Point mutation
Answer: (c).Point mutation
Question 28. 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
Answer: (c).a premature termination of the synthesis of a polypeptide
Question 29. When mutations involve vital functions so that the mutants are nonviable, it is a
  1.    nonsense mutation
  2.    lethal mutation
  3.    transversion
  4.    none of these
 Discuss Question
Answer: Option B. -> lethal mutation
Answer: (b).lethal mutation
Question 30. A mutagen is defined as
  1.    an enzyme that repairs mutations
  2.    a chemical or physical agent that induces mutations
  3.    an inhibitor of gene modification
  4.    a molecule which stabilizes DNA thus prevents mutations from occurring
 Discuss Question
Answer: Option B. -> a chemical or physical agent that induces mutations
Answer: (b).a chemical or physical agent that induces mutations

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