Final answer:
Life is indeed possible because living cells maintain a steady state far from thermodynamic equilibrium, functioning as open systems that constantly exchange materials and energy with their environment to sustain dynamic homeostasis and ensure the continuity of necessary life processes.
Step-by-step explanation:
The statement that life is possible because living cells maintain themselves in a steady state, with most of their reactions far from thermodynamic equilibrium, is true. A living cell is an open system constantly exchanging materials with its environment. This constant input and output prevent the cell from reaching a thermodynamic equilibrium, which would result in insufficient free energy for maintaining life. Moreover, cells manage to maintain a steady state where the rate of energy and matter input equals the output, thus sustaining dynamic homeostasis — a balanced internal condition that differs from the external environment. Processes like glycolysis and the production of ATP are examples of how cells achieve this steady state in response to changing energy needs.
Furthermore, the idea of chemical equilibrium is crucial in understanding cellular metabolism. Reactions within a cell are reversible, and a cell would die if its reactions reached equilibrium. Cells avoid this by being open systems, continuously shifting reactants and products to maintain the necessary conditions for life. The ultimate energy source for this complex system of reactions is sunlight, which powers the creation of nutrients through photosynthesis.
Lastly, the principle of dynamic homeostasis is essential for growth and reproduction, requiring the continuous movement of molecules across membranes to sustain life. This homeostasis ensures that the reaction substances stay within optimal concentration ranges necessary for healthy body function.