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F13 6 Assim and Dissim Metabolism(1)

What is the first choice glucose is the first choice

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Unformatted text preview: D). WHAT IS THE FIRST CHOICE? GLUCOSE IS THE FIRST CHOICE CAN USE ASPARTATE, BUT NOT AS MUCH NRG CONSITUTIVE: PRESENT IN CELL ALL THE TIME (GLUCOSE) PHOSPHOFRUCTO KINASE IS PRESENT ALL THE TIME (EX OF CONSTITUTIVE ENZ) NEXT LIEKLY CHOICE IS ANOTHER SUGAR COMPOUND, BUT IT COSTS METABOLIC NRG TOUTILIZE ANOTHER SUGAR THATS NOT CONSTITUIVE , LIKE LACTOSE ENZ TO TRANSPORT LACTOSE INTO CELL COST NRG/DIVIDE AND PULL OFF GLUCOSE =NRG INDUCIBLE ENZYMES (GALACTOSE HYPERMEASE/ CYTASE), : MADE IN RESPONSE TO PRESENCE OF ANOTHER SUGAR, BUT COSTS NRG TO DO IT, ENZYME COST NRG TO PRODUCE, THUS MAKING GLUCOSE THE FIRST CHOICE, THEN ANOTHER SUGAR BACTERIAL ENDEAVOR: ANALAGOUS TO AEROBIC RESP. CONTAINS PATHWAYS SIMILAR TO GLYCOLYSIS AND KREBS (USE SUBSTRATE AND OXIDATIVE PHOS, CONTAIN SIMILAR ETC) Anaerobic respiration Glycolysis & TCA cycle like Electron transport system Substrate level phosphorylation Oxidative phosphorylation MOSTLY DUE TO ETC Net oxidation of substrate Terminal electron acceptor is inorganic molecule other than oxygen (EX: SULFUR) SULFUR WILL ACCEPT ELECTRONS VIA ETC AND PRODUCE HYDROGEN SULFIDE (LIKE WATER BUT NOT WATER)...
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