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MCQs

Total Questions : 71 | Page 4 of 8 pages
Question 31. Genetic diversity indicates
  1.    large gene pool
  2.    small gene pool
  3.    moderate gene pool
  4.    no gene pool
 Discuss Question
Answer: Option A. -> large gene pool
Answer: (a).large gene pool
Question 32. LacA encodes a detoxifying enzyme called
  1.    β-galactoside transacetylase
  2.    helicase
  3.    polymerase
  4.    gyrase
 Discuss Question
Answer: Option A. -> β-galactoside transacetylase
Answer: (a).β-galactoside transacetylase
Question 33. Genes linked on E coli chromosome are
  1.    lacZ
  2.    lacY
  3.    lacA
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 34. In E.coli the metabolism of lactose requires at least
  1.    2 proteins
  2.    3 proteins
  3.    4 proteins
  4.    5 proteins
 Discuss Question
Answer: Option A. -> 2 proteins
Answer: (a).2 proteins
Question 35. The inhibition of gene expression by changing regulatory protein activity is termed as
  1.    gene expression
  2.    gene repression
  3.    gene mutation
  4.    gene localization
 Discuss Question
Answer: Option B. -> gene repression
Answer: (b).gene repression
Question 36. The lac operon expresses the genes whose products catabolize
  1.    maltose
  2.    phosphate
  3.    sucrose
  4.    lactose
 Discuss Question
Answer: Option D. -> lactose
Answer: (d).lactose
Question 37. Choose the incorrect statement with respect to dam and dcm genes?
  1.    Their enzymes are responsible for methylation of DNA
  2.    Dam protein methylates cytosine in –GATC-
  3.    Dcm methylates cytosine in-CCAGG- and –CCTGG- sequences
  4.    The extent of methylation also has effects on the efficiency with which the other restriction enzymes cleave the DNA in vitro
 Discuss Question
Answer: Option B. -> Dam protein methylates cytosine in –GATC-
Answer: (b).Dam protein methylates cytosine in –GATC-
Question 38. LacZΔM15 represents __________
  1.    fully present lacZ gene
  2.    it is not required in alpha complementation
  3.    it represents the lacZ gene with M15 mutation
  4.    it is partially deleted lacZ gene which is needed for alpha complementation
 Discuss Question
Answer: Option D. -> it is partially deleted lacZ gene which is needed for alpha complementation
Answer: (d).it is partially deleted lacZ gene which is needed for alpha complementation
Question 39. How many recombination systems are present in E. coli?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
Answer: (c).3
Question 40. EndA mutation is often induced in host molecules. Choose the correct statement.
  1.    It activates the gene for DNA-specific endonuclease
  2.    It enhances the yield of plasmid DNA preparations only
  3.    It enhances the quality of plasmid DNA preparations only
  4.    It enhances both the quality and yield of plasmid DNA preparations
 Discuss Question
Answer: Option D. -> It enhances both the quality and yield of plasmid DNA preparations
Answer: (d).It enhances both the quality and yield of plasmid DNA preparations

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