Biology Lecture 22

Biology Lecture 22 - Biology Lecture 22 Electron carriers...

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Biology Lecture 22 Electron carriers, pyruvate, and ATP come out of glycolosis Glycolysis means splitting sugars, breaking glucose into two molecules of pyruvate 2 major phases: Energy investment phase i. Requires 2 ATP Energy payoff phase i.4 ATP are made The cell gets a net of 2 ATP, 2 electron carriers, and 2 molecules of pyruvate Energy investment stage Step 1- hexokinase enzyme and ATP adds a phosphate group to glucose and it becomes Glucose-6-phosphate. Phosphate group makes it unstable Step 2- Glucose-6-phosphate is transformed into an isomer Step 3- Phosphofructokinase (allosteric enzyme) and ATP adds another phosphate group to the isomer making it have 2 phosphate groups. We now have a 6-carbon sugar and it’s even more unstable. Step 4- Aldolase splits the 6-carbon sugar into 2 3-carbon sugars Step 5- Isomerase catalyzes the production of G3P Energy payoff stage Step 6- G3P is being oxidized, 2 NAD + are being converted to 2 NADH. For each glucose molecule we have 2 G3P’s. Triose phosphate dehydrogenase adds a phosphate
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Biology Lecture 22 - Biology Lecture 22 Electron carriers...

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