Oxidation and Reduction in Metabolism

by Kevin Ahern, PhD

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    We live in an era where energy needs are very visible to everybody. And not only are energy needs important in the real outside world that we live in, but they're also very big considerations for the cellular environment. In this lecture, I will be talking about metabolism particularly with views with respect to energy and oxidation and reduction. First in this lecture I'll talk about energy considerations and how they relate to metabolic pathways. And then I'll follow this up with a discussion of how oxidation and reduction plays into this. Now when we can think about energy, it's very important to remember that we need to measure some way understand the needs of energy for cell. The needs of energy for cell are measured in terms of useful energy, and the useful energy for a cell is the Gibbs free energy. Now the Gibbs free energy is a measure of what's available to do something as needed. It's called G, and G is a very important concept because the change in the Gibbs free energy, which is called the delta G, is something that tells us immediately whether or not a chemical reaction will occur. So chemists worry about delta G, but so too do biochemists because biochemists have biochemical reactions going on and biochemical reactions obey the same universal laws the chemical reactions outside of cells do. The principle of Gibbs free energy as I said helps us to understand whether a reaction is favorable in one direction or another and I'll talk in a little bit about what it is that makes a reaction favorable or unfavorable. But if the delta G for a given reaction has a value that's less than zero, the reaction will move forward. If a reaction has a delta G that's...

    About the Lecture

    The lecture Oxidation and Reduction in Metabolism by Kevin Ahern, PhD is from the course Biochemistry: Basics. It contains the following chapters:

    • Metabolism - Energy Considerations
    • Metabolism
    • Oxidation & Reduction
    • Electron Carriers

    Included Quiz Questions

    1. It will equal zero when the concentration of reactants equals that of products.
    2. It is the only factor determining of the direction of a reaction.
    3. It is zero only when a reaction is at equilibrium.
    4. It is related to the change in standard Gibbs free energy.
    1. ...increasing products will increase it.
    2. ...the value of R varies from one reaction to another.
    3. ...it is equal to the value of the standard Gibbs free energy change when the system is at equilibrium.
    4. ...it is negative only if the standard Gibbs free energy change is negative.
    1. ...does not affect the standard Gibbs free energy change.
    2. ...involves removal of products.
    3. ...causes the change in the standard Gibbs free energy to decrease.
    4. ...causes the change in Gibbs free energy to increase.
    1. ...involve loss of electrons.
    2. ...require oxygen.
    3. ...usually require input of energy.
    4. ...require NADH.

    Author of lecture Oxidation and Reduction in Metabolism

     Kevin Ahern, PhD

    Kevin Ahern, PhD

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