CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Each step of glycolysis has a negative free-energy change.
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Each step of glycolysis has a positive free-energy change.
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Overall under typical cellular conditions, glycolysis has a negative free-energy change, though there are steps of both positive and negative free-energy change.
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Overall under typical cellular conditions, glycolysis has a positive free-energy change, though there are steps of both and negative free-energy change.
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Detailed explanation-1: -The energetics of glycolysis include, from one glucose molecule, two molecules of glyceraldehyde 3-phosphate are formed in the second stage of glycolysis from which, the two molecules of pyruvate are obtained as end products of glycolysis.
Detailed explanation-2: -The second half of glycolysis is called the energy payoff phase. In this phase, the cell gains two ATP and two NADH compounds. At the end of this phase, glucose has become partially oxidized to form pyruvate.
Detailed explanation-3: -The reactions of glycolysis result in the breakdown of glucose into pyruvate, with the net gain of two molecules of ATP (Figure 2.32). The initial reactions in the pathway actually consume energy, using ATP to phosphorylate glucose to glucose-6-phosphate and then fructose-6-phosphate to fructose-1, 6-bisphosphate.
Detailed explanation-4: -Glycolysis is the metabolic pathway that converts glucose (C 6H 12O 6) into pyruvate. The free energy released in this process is used to form the high-energy molecules adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide (NADH).