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MCQs

Total Questions : 195 | Page 17 of 20 pages
Question 161. In conjugation only small fragments of the bacterial chromosome are transferred.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 162. What is the shape of DNA in the male cells of E.coli?
  1.    linear
  2.    supercoiled
  3.    circular
  4.    relaxed
 Discuss Question
Answer: Option C. -> circular
Answer: (c).circular
Question 163. Which type of E.coli strain was chosen to prove the experiment of conjugation?
  1.    prototrophs
  2.    auxotrophs
  3.    polyauxotrophs
  4.    autotrophs
 Discuss Question
Answer: Option C. -> polyauxotrophs
Answer: (c).polyauxotrophs
Question 164. Which of the following cells of E.coli are referred to as F—?
  1.    Male cells
  2.    Female cells
  3.    Both male and female cells
  4.    Neither male nor female cells
 Discuss Question
Answer: Option B. -> Female cells
Answer: (b).Female cells
Question 165. What is the frequency of formation of recombinants in a F+ X F— cross?
  1.    100
  2.    40
  3.    10
  4.    1
 Discuss Question
Answer: Option D. -> 1
Answer: (d).1
Question 166. Which of the following was the first amino acid to be produced commercially?
  1.    L-glutamic acid
  2.    L-lysine
  3.    L-cystine
  4.    L-methionine
 Discuss Question
Answer: Option B. -> L-lysine
Answer: (b).L-lysine
Question 167. The Candida species require fermentation equipment lined with plastic because they are extremely sensitive to
  1.    traces of cobalt
  2.    traces of nickel
  3.    traces of iron
  4.    none of these
 Discuss Question
Answer: Option C. -> traces of iron
Answer: (c).traces of iron
Question 168. Cycloserine may be isolated from the cultures of
  1.    S. orchidaceus
  2.    S. lavendulae
  3.    S. garyphalus
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 169. It is mandatory that cultures and fermentation residues be sterilized before discard in case of Eremothecium ashbyii and Ashbya gossypii because they are
  1.    plant pathogens
  2.    human pathogens
  3.    plant mutants
  4.    none of these
 Discuss Question
Answer: Option A. -> plant pathogens
Answer: (a).plant pathogens
Question 170. The first penicillin isolated by Alexander Fleming, penicillin F is also called
  1.    2-Pentenyl Penicillin
  2.    n-heptyl penicillin
  3.    phenoxymethyl penicillin
  4.    benzyl penicillin
 Discuss Question
Answer: Option A. -> 2-Pentenyl Penicillin
Answer: (a).2-Pentenyl Penicillin

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