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MCQs

Total Questions : 310 | Page 25 of 31 pages
Question 241. The relationship between an oxidation-reduction potential difference and the standard free energy change is (where n is the number of moles of electron transferred, F= Faraday's constant and E°= standard oxidation-reduction potential difference)
  1.    ΔG° = nFlnE°
  2.    ΔG° = -nFlnE°
  3.    ΔG° = -nFE°
  4.    ΔG° = nFE°
 Discuss Question
Answer: Option C. -> ΔG° = -nFE°
Question 242. The bacteriochlorophylls used by the anoxygenic bacteria have absorbance maxima located in the_____portion(s) of the spectrum.
  1.    blue
  2.    infrared
  3.    green
  4.    ultraviolet
 Discuss Question
Answer: Option B. -> infrared
Question 243. Phosphate deregulated mutants are
  1.    less sensitive to phosphate regulation
  2.    none of these
  3.    moderately sensitive to phosphate regulation
  4.    highly sensitive to phosphate regulation
 Discuss Question
Answer: Option A. -> less sensitive to phosphate regulation
Question 244. The mechanism of passive or facilitated diffusion require
  1.    metabolic energy
  2.    accumulation or concentration of solute against an electrochemical gradient
  3.    concentration of solute against an electrochemical gradient
  4.    accumulation of solute against an electrochemical gradient
 Discuss Question
Answer: Option A. -> metabolic energy
Question 245. Radioisotopes are frequently used in the study of cells. Assume a culture of E. coli is grown in a culture medium containing radioactive sulphur. At the end of 48 hours, it is expected to find the radioactive label located in
  1.    enzymes
  2.    DNA
  3.    all of these
  4.    RNA
 Discuss Question
Answer: Option A. -> enzymes
Question 246. Nitrogen fixation is a process that requires
  1.    an aerobic environment
  2.    energy
  3.    both (a) and (b)
  4.    an anaerobic environment
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 247. Bacteriochlorophyll differs from chlorophyll in what way?
  1.    There are chemical differences between the two chlorophyll in their side (R) groups
  2.    They have different absorption spectra
  3.    Both (b) and (c)
  4.    The chelated metal in bacteriochlorophyll is not Mg
 Discuss Question
Answer: Option C. -> Both (b) and (c)
Question 248.  
During the carboxylation phase of the Calvin cycle, CO2 combines with
  1.    ribulose 1,5 - bisphosphate
  2.    phosphoglyceraldehyde
  3.    pyruvic acid
  4.    oxaloacetic acid
 Discuss Question
Answer: Option A. -> ribulose 1,5 - bisphosphate
Question 249.  In the passive diffusion, solute molecules cross the membrane as a result of
  1.    concentration difference
  2.    pressure difference
  3.    ionic difference
  4.    all of these
 Discuss Question
Answer: Option A. -> concentration difference
Question 250.  
Which of the following groups contain(s) many unique coenzymes, such as coenzyme M and coenzyme F420?
  1.    Sulfate-reducing bacteria
  2.    Methanotrophs (methane-oxidizing microbes)
  3.    Methanogens (methane-producing microbes)
  4.    Acetogens (acetigens; acetate-producing microbes)
 Discuss Question
Answer: Option C. -> Methanogens (methane-producing microbes)

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