In this lesson you will be introduce to the fundamentals of energy and its transformations (thermodynamics) within living cells.
By the end of this lesson, students should be able to:
- use appropriate terminology related to metabolism (i.e. metabolic pathway, catabolic, anabolic, thermodynamics, entropy, free energy, exergonic reactions, endergonic reactions, equilibrium, etc.)
- use the laws of thermodynamics (1st and 2nd Laws) to explain energy transfer in cells.
- define the 1st Law (Law of Conservation of Energy) and 2nd Law of Thermodynamics.
- explain the relationship between enthalpy (total internal energy) and entropy (degree of disorder) or any biological system using the mathematical expression DG= DH-TDS
- determine the spontaneity of chemical reactions from their DG values.
- list the types of work performed by living cells.
- explain why living cells couple exergonic processes to endergonic processes and the role of ATP in energy coupling..
- explain how redox reactions are coupled reactions and how electron carriers store energy as reducing power.
Let’s start by examining the fundamentals of energy, thermodynamics and metabolism in the video lesson below. Please watch this lesson carefully, and write down key points.
A very important concept in cell metabolism is the coupling of exergonic reactions to endergonic, mediated by the hydrolysis of ATP. A clear explaining of this processes is presented in the video lesson below. Please take notes as you watch the lesson below.