Glycolysis and the Krebs Cycle Worksheet Answer Key, Exercises of Biochemistry

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Glycolysis and the Krebs Cycle ‘What reactions occur in the cell to turn glucose into carbon dioxide? Why? Glucose is a high potential energy molecule. Carbon dioxide on the other hand is a very stable, low poten- tial energy molecule. When a glucose molecule is converted to carbon dioxide and water during cellular respiration, energy is released and stored in high potential energy ATP molecules. The three phases of cel- lular respiration that oxidize the glucose molecule to carbon dioxide are glycolysis, the Link reaction and the Krebs cycle. Model 1 - Glycolysis 9 oO ll | o 9 = HO C~CHACH,-O-F-O" | I [ II O—P-O—-C~CH-CH,-O-P-O” OH oO Il i II Phosphoglyceraldehyde ° OH fe} (PGAL) 1,3-Bisphosphoglycerate a PGAL x2 (1,3-BPG) 5 2aDP 2 NAD* +2 Ht +22; 2 2ATP Ss es 2 NADH é - Glucose 1,3 BPG x 2 4ADP GG 4 ATP oO Pyruvate Pyruvate x 2 1. Refer to Model 1. a. What molecule from food is the primary reactant for glycolysis? Glucose. 4. How many carbon atoms are in that reactant molecule? Glucose has six carbon atoms. 2. The carbon atoms from glucose end up in pyruvate molecules as a product of glycolysis. a. How many carbon atoms are in a pyruvate molecule? Pyruvate has three carbon atoms. 6. How many pyruvate molecules are made from each glucose molecule? Two pyruvate molecules are made from one glucose molecule. Glycolysis and the Krebs Cycle 77