Free energy Original Scenario-Based Download PDF

Questions

1. 1.

   A deep-sea research team exploring abyssal hydrothermal vents isolates an anomalous barophilic bacterium, Titanococcus profundus, that rapidly synthesizes an essential structural polymer inside its cytoplasm. Direct calorimetric measurements reveal that the formation of this polymer from simple monomers has a standard Gibbs free energy change of $\Delta G = +31.4$ kJ/mol. Which biochemical strategy best explains how the cell thermodynamically drives this process to sustain continuous polymer production?

   • A) The cell couples the polymer synthesis to a strongly exergonic process, ensuring that the net Gibbs free energy change for the overall pathway is negative.
   • B) The cell utilizes a specialized extremophilic enzyme that lowers the activation energy enough to change the net free energy difference from positive to negative.
   • C) The cell accumulates high concentrations of the finished polymer inside cytoplasmic inclusions to thermodynamically pull the forward synthesis reaction.
   • D) The cell prevents thermal dissipation so that cellular heat trapped within the active site directly converts the endergonic step into an entropy-driven spontaneous process.