BIO NOTES LECTURE 1

BIO NOTES LECTURE 1 - Exergonic reactions are those in...

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substrates products free energy change reaction free energy exergonic reaction substrates products reaction endergonic reaction LECTURE 1: METABOLISM Name What is it? What is it comprised of/ Extra info 1 st Law of Thermodynamics States that the total amount of energy is constant. Energy can be transformed from one form to another, but it can't be destroyed or created. 2 nd Law of Thermodynamics States that the entropy of the universe is constantly increasing. Also states that all transformations proceed downhill with regard to useful energy, because entropy always increases. According to the 2nd Law, the free energy of the universe decreases continually. Chemiosmotic Theory States that most ATP is synthesized from a pH Gradient. Discovered by Mitchell. This revolutionary theory was proved by the action of uncouplers: proton channels in the lipid membranes that destroyed ATP production by leaking protons. Free Energy Aka, Gibbs energy. The decrease of free energy is what drives chemical reactions. ____________ Exergonic reactions
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Unformatted text preview: Exergonic reactions are those in which free energy decreases when substrates are converted to products. They proceed spontaneously. Endergonic reactions Endergonic reactions are those in which free energy increases. They will proceed only if energy is added. LECTURE 1: METABOLISM Energy Coupling Delivers necessary energy for endergonic reactions, either through coupling or energy intermediates. Oxidation Reaction Type of Redox Reaction: loss of an electron (or addition of oxygen, since oxygen hogs electrons) or loss of an entire H atom (hydrogen donates an electron in polar bonds). Oxidation is an exergonic reaction Reduction Reaction Type of Redox Reaction: Involves an acquisition of an election. Is an endergonic reaction Redox Reaction Coupled Reduction and Oxidation Reactions They are common in cell metabolism and involve transfer of electrons from one atom or molecule to another Energy Intermediates LECTURE 1: METABOLISM...
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This note was uploaded on 04/17/2008 for the course BSC 2010 taught by Professor Pf during the Spring '08 term at FSU.

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BIO NOTES LECTURE 1 - Exergonic reactions are those in...

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