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MCQs

Total Questions : 282 | Page 26 of 29 pages
Question 251.  Restriction enzymes
  1.    protect bacteria from viral infection
  2.    cut DNA in a staggered fashion
  3.    cut DNAs producing a blunt end
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 252. . First discovered, Type II restriction endonuclease was
  1.    Hinf I
  2.    Eco K
  3.    Hind II
  4.    EcoRI
 Discuss Question
Answer: Option C. -> Hind II
Question 253. . The transfer of antibiotic-resistant genes from genetically engineered bacteria to disease-causing bacteria __________ .
  1.    would be of no concern if it occurred.
  2.    has occurred
  3.    can never occur
  4.    seems unlikely
 Discuss Question
Answer: Option D. -> seems unlikely
Question 254. . Both DNA gel electrophoresis and SDS-PAGE of proteins are similar because
  1.    in both cases molecules migrate to the anode
  2.    both techniques rely on a constant charge to mass ratio
  3.    both techniques utilize the sieving properties of gels
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 255. . Some genetic diseases cannot be diagnosed by changes in restriction sites. Some of these can be detected by allele-specific oligonucleotide probes. These are
  1.    copies of the gene with an altered sequence so that a restriction site is inserted
  2.    mutagenized copies of a gene
  3.    short sequences that will hybridize only to a specific base sequence
  4.    PCR-amplified variable numbers of tandem repeats (VNTRs)
 Discuss Question
Answer: Option C. -> short sequences that will hybridize only to a specific base sequence
Question 256. . 
Which of the following techniques can be used to determine the defective gene and for developing cancer?
  1.    Western blot
  2.    Southern blot
  3.    Northern blot
  4.    Eastern blot
 Discuss Question
Answer: Option B. -> Southern blot
Question 257. . Which of the following genetic diseases would be amenable to genetic engineering?
  1.    Down's syndrome
  2.    Muscular dystrophy
  3.    Cystic fibrosis
  4.    Cri du Chat
 Discuss Question
Answer: Option C. -> Cystic fibrosis
Question 258. . In order to insert a foreign gene into a plasmid, both must __________
  1.    have identical DNA sequences
  2.    originate from the same type of cell
  3.    be cut by the same restriction enzyme
  4.    be of the same length
 Discuss Question
Answer: Option C. -> be cut by the same restriction enzyme
Question 259. . Which type of restriction enzymes do not usually require ATP?
  1.    Type I
  2.    Type II
  3.    Type III
  4.    Type IV
 Discuss Question
Answer: Option B. -> Type II
Question 260. . Why is golden rice pale yellow in color?
  1.    It is rich in chlorophyll a.
  2.    It is rich in beta-carotene.
  3.    It is rich in chlorophyll b.
  4.    It is rich in phycobilins.
 Discuss Question
Answer: Option B. -> It is rich in beta-carotene.

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