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Need help with all of these questions!!!! Need help with all of these questions!!!! 31) The allosteric enzyme phospotructokinase is switched off by a) glucose b) isocitrate c) AMP d) ATP 32) One step in the catabolism of glucose involves the conversion of glucose 6-phosphate into a) glucose b) fructose 6-phosphate c) glucose 3-phosphate d) pyruvate 33) Where in a cell do the formation of acetyl-CoA and the citric acid cycle occur? a) cytoplasm c) nucleus d) lysosome 34) Glycolysis is controlled in steps a) 1, 2, and3 b) 2, 5 and 7 c) 1, 3 and 10 d) 3, 5 and8 35) Gluconeogenesis is a process by which glucose is produced a) in the liver from noncarbohydrate sources. b) in the mitochondrion if there is an excess of fructose c) by the enzymes located on the cristac. d) by exactly reversing the process of glycolysis. 36) The biosynthesis of glucose takes place in a series of reactions known as a) glycolysis b) gluconeogenesis c) the citric acid cycle d) the electron transport chain 37) Gluconeogenesis is a form of a) metabolism b) catabolism c) anabolism d) hydrolysis 38) One way that insulin reduces blood sugar is by

Explanation / Answer

Ans 31 . D) ATP

Phosphofructokinase is an enzyme that phosphorylates Fructose -1-phosphate into fructose-1,6-diphosphate.

If ATP builds up in the cell , or citrate (1st product of kreb's cycle) , or PEP , it allosterically inhibits the enzyme to stop the phosphorylation ,as the energy is no more needed momentarily.

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