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MCQs

Total Questions : 282 | Page 24 of 29 pages
Question 231. A plasmid
  1.    is a circular DNA molecule
  2.    usually contains one or more restriction sites
  3.    always contains an origin of replication
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 232. An example of a restriction fragment length polymorphism is
  1.    All of these
  2.    cystic fibrosis results from a three base deletion in most cases but in other cases, other mutations are involved
  3.    different length fragments of DNA resulting from loss or gain of a restriction site
  4.    an Eco RI cuts DNA at a different sequence than Hind III
 Discuss Question
Answer: Option C. -> different length fragments of DNA resulting from loss or gain of a restriction site
Question 233. Under which of the following conditions would population gene frequencies remain the same?
  1.    Small population size
  2.    Active migration between groups
  3.    Selection for homozygotes
  4.    Random mating
 Discuss Question
Answer: Option D. -> Random mating
Question 234. The unpaired nucleotides produced by the action of restriction enzymes are referred to have
  1.    ligases
  2.    sticky ends
  3.    restriction fragments
  4.    single strands
 Discuss Question
Answer: Option B. -> sticky ends
Question 235. Plant transformation can be obtained by
  1.    combining plant and animal cells in culture
  2.    shooting DNA into plant cells with a gun
  3.    using the E. coli bacterium to infect plant roots
  4.    infecting plants with a tobacco mosaic virus
 Discuss Question
Answer: Option B. -> shooting DNA into plant cells with a gun
Question 236. Which of these genes codes for a protein that plays a role in growth?
  1.    KRTHA1
  2.    GH1
  3.    SCLC6A4
  4.    DCP1
 Discuss Question
Answer: Option B. -> GH1
Question 237. An expression vector
  1.    always contains an origin of replication
  2.    always contains DNA segments for the regulation of mRNA production
  3.    All of these
  4.    usually contains a gene that confers antibiotic resistance to the bacterial host
 Discuss Question
Answer: Option C. -> All of these
Question 238. Which of the following is not true of small inbreeding populations?
  1.    There is an increased incidence of recessive diseases
  2.    Mutation is increased
  3.    Alleles may become fixed
  4.    They tend to loose genetic diversity
 Discuss Question
Answer: Option B. -> Mutation is increased
Question 239. Which of the following pair will produce complementary sticky ends?
  1.    Eco RI & MspI
  2.    Sau 3A & Bam HI
  3.    Msp I & HPA II
  4.    Mbo I & Sau 3A
 Discuss Question
Answer: Option B. -> Sau 3A & Bam HI
Question 240. What enzyme forms covalent bonds between restriction fragments?
  1.    DNA polymerase
  2.    DNA ligase
  3.    DNA primase
  4.    DNA helicase
 Discuss Question
Answer: Option B. -> DNA ligase

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