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Final

Lecture 6 - final review.docx

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Department
Biochem & Molecular Biology
Course Code
BIOC 2300
Professor
Dr.Carmichael Wallace

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Lecture 6
Oxidation/reduction
Oxidation loss of electrons
O I L R I G oxidation is the loss of electrons, reduction is the gain of electrons
Managing electrons
- Two prominent coenzymes accept electrons (BECOME REDUCED) and transfer them to
O2
oNicotinamide adenine dinucleotide (NAD+) – requires niacin(acquired in the diet)
oFlavin adenine dinucleotide (FAD) – requires riboflavin (acquired in the diet)
oAlso, nicotinamide adenine dinucleotide phosphate (NADP+) carries electrons but
its role is mainly in reductive biosynthesis
Oxidation-reduction reactions
- In living organisms, energy-capturing and energy-releasing processes involve redox
reactions
- Many redox reactions have both an electron and a proton transferred
oNAD+ accepts a proton and two electrons to become NADH
oFAD accepts 2 protons and 2 electrons to become FADH2
- Conversion of pyruvate and NADH to lactate and NAD+ is under anaerobic conditions
Redox Potential of Redox Reactions
- We can determine the reduction potential of a component’s half reactions
o∆E° = E°(e- acceptor) - E°(e- donor)
oWhen ∆E° is POSITIVE ∆G° is NEGATIVE SO the reaction is SPONTANEOUS
oRelationship of standard reduction potentials (∆E°) and standard free energy
(∆G°) is  ∆G°’ = -nF∆E°’
Electrons flow spontaneously from a species with a more negative E°’ to a
species with a more positive E°’

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Description
Lecture 6 Oxidation/reduction Oxidation loss of electrons O I L R I G oxidation is the loss of electrons, reduction is the gain of electrons Managing electrons - Two prominent coenzymes accept electrons (BECOME REDUCED) and transfer them to O 2 o Nicotinamide adenine dinucleotide (NAD ) – requires niacin(acquired in the diet) o Flavin adenine dinucleotide (FAD) – requires riboflavin (acquired in the diet) o Also, nicotinamide adenine dinucleotide phosphate (NADP ) carries electrons but its role is mainly in reductive biosynthesis Oxidation-reduction reactions - In living organisms, energy-capturing and energy-releasing processes involve redox reactions - Many redox reactions have both an electron and a proton transferred o NAD+ accepts a proton and two electrons to become NADH o F
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