Bio134S2017 Lecture 10 MT 1.pptx - Welcome to Biology 134/135 Microbiology Which of the following best describes the difference between FAD and FADH2 A

Bio134S2017 Lecture 10 MT 1.pptx - Welcome to Biology...

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Welcome to Biology 134/135 Microbiology
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Which of the following best describes the difference between FAD and FADH 2 ? A) FADH 2 has 2 more electrons than FAD (picks up a H+) B) FADH 2 is only used in anabolic processes. C) Only FAD is defined as an electron carrier. D) FADH 2 is in a lower energy state than FAD. E) There are no differences between them; they are exactly the same.
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Announcements • The first midterm exam is February 24 th .
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Chemical reactions A B A B + activation energy activation energy with enzyme A B + initial energy A B final energy energy enzyme substrates product fire room temp “free energy”
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Reaction Linking • A favorable reaction can drive an unfavorable one, if they’re linked by an enzyme CO 2 H 2 O sugar + ATP ADP + P CO 2 H 2 O sugar + ATP ADP + P + + enzyme enzyme + low energy higher energy low energy high energy
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Enzyme types • Oxido-reductase: Transferring electrons between molecules higher energy lower energy lower energy higher energy • If B "wants" the electron more than A, it is a favorable reaction • This reaction can be linked with unfavorable reactions to drive them
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Example of Oxidation-Reduction Oxidation-reduction reactions allow energy to be stripped in small amounts Transfer of electrons is often accompanied by transfer of hydrogen (1 proton... balances the charge!)
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  • LeslieA.King

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