Bioenergetics I: Concept of free energy

Bioenergetics I: Concept of free energy

January 7, 2022

Bioenergetics

  • Bioenergetics is the quantitative study of energy transductions in living system. OR
  • Quantitative study of energy transformation including the nature and function of the chemical processes underlying these transformations.

Biological Energy Transformations Obey the Laws of Thermodynamics

  • The first law of thermodynamics “the principle of the conservation of energy”
  • For any physical or chemical change, the total amount of energy in the universe remains constant; energy may change its forms or it may be transported from one region to another, but it cannot be created or destroyed

The second law is the principle of randomness

  • The universe always moves toward increasing disorder “in all natural processes, the entropy of the universe increases”.
  • Living organisms operate strictly within the principles of law of randomness.
  • To understand the applications of the second law to biological systems, we must first define those systems and their surroundings.
  • The reacting system and its surroundings together constitute the universe.
  • Isolated or closed systems, in which no material or energy is exchanged with the surroundings. For examples, in the laboratory, some chemical or physical processes

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