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MCQs

Total Questions : 241 | Page 23 of 25 pages
Question 221. The word, used for the small solid supports onto which are spotted hundreds of thousands of tiny drops of DNA that can be used to screen gene expression, is
  1.    DNA microarrays
  2.    cloning library
  3.    southern blot
  4.    northern blot
 Discuss Question
Answer: Option A. -> DNA microarrays
Question 222. Which of the following organisms has the smallest genome?
  1.    None of these
  2.    H. influenzae
  3.    M. tuberculosis
  4.    M. genitalium
 Discuss Question
Answer: Option D. -> M. genitalium
Question 223. Why Deinococcus radiodurans is able to survive massive exposure to radiation?
  1.    Because its cellwall contains radioactive elements
  2.    Because it produces a thick shell which acts as a shield from the radiation
  3.    Because it has unique DNA repair mechanisms
  4.    Because it has many copies of genes encoding DNA repair
 Discuss Question
Answer: Option D. -> Because it has many copies of genes encoding DNA repair
Question 224.  In the time since E. coli and Salmonella diverged evolutionarily
  1.    there has been little change in either genome
  2.    E. coli has acquired many genes via horizontal transfer
  3.    E, coli has lost approximately 50% of its genome
  4.    none of these
 Discuss Question
Answer: Option C. -> E, coli has lost approximately 50% of its genome
Question 225.  Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ?
  1.    Parasitic bacteria have very large genomes
  2.    Parasites have a definite genomic sequence similar to viruses
  3.    Mitochondria have evolved from endosymbiotic bacteria
  4.    All bacteria evolved from viruses
 Discuss Question
Answer: Option C. -> Mitochondria have evolved from endosymbiotic bacteria
Question 226.  The physical nature of genomes is studied under
  1.    structural genomics
  2.    comparative genomics
  3.    proteo genomics
  4.    functional genomics
 Discuss Question
Answer: Option A. -> structural genomics
Question 227.  The flow of genetic material in microbial cells usually takes place from
  1.    RNA through DNA to proteins
  2.    proteins through RNA to DNA
  3.    DNA through RNA to proteins
  4.    none of these
 Discuss Question
Answer: Option C. -> DNA through RNA to proteins
Question 228.  What is the range of minimum set of genes required for life?
  1.    50-100 genes
  2.    250-350 genes
  3.    1000-1500 genes
  4.    1500-2000 gene
 Discuss Question
Answer: Option B. -> 250-350 genes
Question 229.  Why the bacterium Treponema pallidum is difficult to culture?
  1.    Because it requires a great deal of water to reproduce
  2.    Because it is unable to use carbohydrates as an energy source
  3.    Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
  4.    Because it requires extremely low temperature at which water freezes
 Discuss Question
Answer: Option C. -> Because it lacks the genes needed for TCA cycle and oxidative phosphorylation
Question 230.  The species of bacteria, which possesses 250 genes for lipid biosynthesis is
  1.    M. genitalium
  2.    M. tuberculosis
  3.    E. coli
  4.    H. influenzae
 Discuss Question
Answer: Option B. -> M. tuberculosis

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