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  • Question
  • Which of the following statement is correct?


  • Options
  • A. Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
  • B. Phosphate repression can be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains
  • C. Phosphate repression can be eliminated by optimization of nutrient medium, regulated medium must be used as production strains
  • D. Phosphate repression can not be eliminated by optimization of nutrient medium, regulated medium must be used as production strains

  • Correct Answer
  • Phosphate repression can not be eliminated by optimization of nutrient medium, deregulated medium must be used as production strains 


  • Microbial Metabolism problems


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    • 1. If ?G of a chemical reaction has a negative value, the reaction

    • Options
    • A. releases energy
    • B. requires energy
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 2. The mechanism of passive or facilitated diffusion require

    • Options
    • A. metabolic energy
    • B. concentration of solute against an electrochemical gradient
    • C. accumulation of solute against an electrochemical gradient
    • D. accumulation or concentration of solute against an electrochemical gradient
    • Discuss
    • 3. ATPase

    • Options
    • A. synthesizes ATP, coupled to transfer of extracellular protons into the cell
    • B. extrudes protons from the cell coupled to the hydrolysis of ATP to ADP
    • C. is the enzyme that incorporates ATP into messenger RNA
    • D. carries out each of the reactions indicated in (a) and (b)
    • Discuss
    • 4. Phosphate regulation has been observed in the production of

    • Options
    • A. alkaloids
    • B. antibiotics
    • C. gibberelins
    • D. all of these
    • Discuss
    • 5. During the carboxylation phase of the Calvin cycle, CO2 combines with

    • Options
    • A. ribulose 1,5 - bisphosphate
    • B. phosphoglyceraldehyde
    • C. pyruvic acid
    • D. oxaloacetic acid
    • Discuss
    • 6. Which of the following is responsible for phosphate solubilization?

    • Options
    • A. Streptococcus
    • B. Streptomyces
    • C. Bacillus
    • D. Clostridium
    • Discuss
    • 7. As the electron flow through the chains, much of their free energy is conserved in the form of ATP. This process is called

    • Options
    • A. oxidative phosphorylation
    • B. electromotive potential
    • C. dehydrogenations
    • D. none of these
    • Discuss
    • 8. Free energy change (?G) of a reaction is referred as the amount of energy

    • Options
    • A. liberated during reaction
    • B. taken up during reaction
    • C. liberated or taken up during reaction
    • D. none of these
    • Discuss
    • 9. Phosphate is considered to restrict the induction of

    • Options
    • A. primary metabolites
    • B. secondary metabolites
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 10. Which of the following groups contain(s) many unique coenzymes, such as coenzyme M and coenzyme F420?

    • Options
    • A. Sulfate-reducing bacteria
    • B. Methanotrophs (methane-oxidizing microbes)
    • C. Methanogens (methane-producing microbes)
    • D. Acetogens (acetigens; acetate-producing microbes)
    • Discuss


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