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MCQs

Total Questions : 310 | Page 26 of 31 pages
Question 251.  In an oxygenic photosynthesis, the green and the purple bacteria do not use which of the following one as an electron source?
  1.    H2O
  2.    H2
  3.    H2S
  4.    S (elemental sulphur)
 Discuss Question
Answer: Option A. -> H2O
Question 252.  The chlorophyll molecules used by eucaryotes and cyanobacteria absorb radiant energy in the____________portion(s) of the visible spectrum.
  1.    red
  2.    green
  3.    red and blue
  4.    green and ultraviolet
 Discuss Question
Answer: Option C. -> red and blue
Question 253.  Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive phosphorous. At the end of 48 hours, it is expected to find the radioactive label located in
  1.    enzymes
  2.    RNA
  3.    phospholipids
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 254.  Assimilatory sulfate reduction involves the nucleotide __________ during the incorporation of H2S in the production of __________ .
  1.    ATP; methionine
  2.    ATP; cytosine
  3.    UTP; cytosine
  4.    GTP; cytosine
 Discuss Question
Answer: Option B. -> ATP; cytosine
Question 255.  In aerobic respiration, the terminal electron acceptor is
  1.    oxygen
  2.    nitrogen
  3.    hydrogen
  4.    nitrate
 Discuss Question
Answer: Option A. -> oxygen
Question 256.  Which of the following statement is correct?
  1.    Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
  2.    Phosphate repression can be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
  3.    Phosphate repression can be eliminated by optimization of nutrient medium, regulated medium must be used as production strains
  4.    Phosphate repression can not be eliminated by optimization of nutrient medium, regulated medium must be used as production strains
 Discuss Question
Answer: Option A. -> Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
Question 257. . The acquisition energy by glucose fermentation requires
  1.    substrate-level phosphorylation
  2.    electron transport of electrons from NADH
  3.    long-chain fatty acid oxidation
  4.    the enzyme formic-hydrogen lyase
 Discuss Question
Answer: Option A. -> substrate-level phosphorylation
Question 258. . High energy transfer compounds are capable of
  1.    accepting large amounts of free energy
  2.    transferring large amounts of free energy
  3.    measuring free energy
  4.    none of the above
 Discuss Question
Answer: Option B. -> transferring large amounts of free energy
Question 259. . Dolichol phosphate is
  1.    a complex lipid involved in docking vesicles with the plasma membrane
  2.    the anchor on which sugars assemble before transfer to proteins
  3.    a chaperone used in protein folding
  4.    a product of phospholipase C activation
 Discuss Question
Answer: Option B. -> the anchor on which sugars assemble before transfer to proteins
Question 260. . The reactions of the cell that are carried out for capturing energy are called
  1.    catabolism
  2.    metabolism
  3.    anabolism
  4.    activation energy
 Discuss Question
Answer: Option A. -> catabolism

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