E-PolyLearning

41. Which of the following is nutritional characterization of Escherichia coli?
a. Chemotrophic
b. Organotrophic
c. Autotrophic
d. Chemotrophic, Organotrophic, Heterotrophic
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Answer: (d).Chemotrophic, Organotrophic, Heterotrophic

42. Which of the following amino acids require sulphur for their synthesis?
a. tryptophan
b. methionine
c. cystine
d. methionine and cystine
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Answer: (d).methionine and cystine

43. Phosphorus is essential component of __________
a. teichoic acid
b. nucleotides
c. phospholipids
d. teichoic acid, nucleotides, phospholipids
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Answer: (d).teichoic acid, nucleotides, phospholipids

44. Which of the following are trace elements?
a. Potassium ion
b. Sodium ion
c. Copper ion
d. Magnesium ion
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Answer: (c).Copper ion

45. Which of the following ions are cofactors for various enzymes?
a. Potassium ion
b. Iron ion
c. Magnesium ion and Iron ion
d. Calcium ion
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Answer: (c).Magnesium ion and Iron ion