Bio134S2017 Lecture 11 MT 1.pptx - Welcome to Biology 134/135 Microbiology Old exam question Catabolic processes are ones that A build complex molecules

Bio134S2017 Lecture 11 MT 1.pptx - Welcome to Biology...

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Welcome to Biology 134/135 Microbiology
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Catabolic processes are ones that A. build complex molecules from simple ones. B. require oxygen at lower levels than normally found in the atmosphere. C. transfer electrons along an electron transport chain. D. do not require oxygen. E. generate energy for the cell. Old exam question:
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Announcements • The first midterm exam is February 24 th .
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Metabolism Definition: The sum of all chemical reactions within a living organism. - Breaking things down - Building things up - Movement of the cell - Transport across membranes
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Catabolic vs. Anabolic Complex molecules: sugar (C 6 H 12 O 6 ) Simple molecules: H 2 O, CO 2 Anabolic Catabolic energy
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Getting energy from carbohydrates We'll study the way glucose is catabolized to gain energy Glycolysis Cellular Respiration Fermentation
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Glycolysis glucose = C 6 H 12 O 6 2 pyruvic acid = 2 x C 3 H 4 O 3 2 ATP P 2 ADP + 4 ATP P 4 ADP + 4 2 NAD + 2 NADH + H + 10 steps, each with its own enzyme!
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Glycolysis Net result: glucose = C 6 H 12 O 6 2 pyruvic acid = 2 x C 3 H 4 O 3 Generated: 2 ATP 2 NADH
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Cellular Respiration Fermentation What to do with the pyruvic acid? Glucose Pyruvic acid
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Fermentation: Alcohol fermentation 2 pyruvic acid = 2 x C 3 H 4 O 3 2 CO 2 2 ethanol = 2 x C 2 H 6 O 2 NAD + 2 NADH + H +
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Fermentation: Net result: 2 pyruvic acid = 2 x C 3 H 4 O 3 2 ethanol = 2 x C 2 H 6 O Lost: 2 NADH + 2 CO 2
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Fermentation: Lactic acid fermentation 2 pyruvic acid = 2 x C 3 H 4 O 3 2 lactic acid = 2 x C 3 H 6 O 3 2 NAD + 2 NADH + H +
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Fermentation: Net result: 2 pyruvic acid = 2 x C 3 H 4 O 3 Lost: 2 NADH 2 lactic acid = 2 x C 3 H 6 O 3
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Many types of fermentation: We do it too! Lactic acid fermentation happens in the muscles during intense exercise
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Why ferment?
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  • Fall '17
  • BRIAN THORNTON

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