Fructose 1, 6-bisphosphate: is produced by hexokinase. Is converted to two molecules of glyceraldehyde 3-phosphate by the enzyme aldolase. is the first committed molecule of glycolysis. inhibits pyruvate kinase. requires ATP to become fructose 6-phosphate in gluconeogenesis? Which enzyme is the primary regulator of glycolysis? Hexokinase Pyruvate Kinase Glyceraldehyde 3 dehydrogenase Phosphoglycerate Kinase Phosphofructokinase-1 Aconitate: oxidizes is citrate. causes the formation of C02. removes a coenzyme A (CoA-SH). regenerates oxaloacetate. isomerizes citrate. Which of the following enzymes reduces the amount of carbons in the molecule? citrate synthase a-ketoglutarate dehydrogenase succinate hexokinase (also known as: succinic CoA synthetize) fumarate malate dehydrogenase Succinate dehydrogenase reduces: FAD to FADH2 NAD+ to NADH. succinate to fumarate. succinic CoA to succinate. a molecule of water. Pyruvate binds to on the El subunit of the pyruvate dehydrogenase complex (PDC). oxoamide (lipoic acid) thiamine pyrophosphate (TPP) FAD coenzyme A (CoA-SH) NAD* The primary regulatory step from pyruvate through the citric acid cycle is: is citrate dehydrogenase a-ketoglutarate dehydrogenase pyruvate dehydrogenase complex citrate synthase succinate hexokinase (also known as: succinic CoA synthetize)
7. B. Is converted to teo molecules of glyceraldehyde-3- phosphate by the enzyme aldolase.
8. E. Phosphofructokinase I.
Phosphofructokinase is the most important control element in the mammalian glycolytic pathway. High levels of ATP allosterically inhibit the enzyme in the liver (a 340-kd tetramer), thus lowering its affinity for fructose 6-phosphate. ATP elicits this effect by binding to a specific regulatory site that is distinct from the catalytic site. AMP reverses the inhibitory action of ATP, and so the activity of the enzyme increases when the ATP/AMP ratio is lowered. In other words, glycolysis is stimulated as the energy charge falls.
9. E. Isomerizes citrate.
10. B. Alpha-ketoglutarate dehydrogenase.
This enzyme converts a 5 carbon compoud alpha-ketoglutarate into 4 carbon compound succinyl coA in Krebs cycle.
11. FAD to FADH2
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