CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ATP
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GTP
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Water
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Carbon dioxide
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Detailed explanation-1: -Question: The conversion of phosphoenolpyruvate (PEP) to pyruvate is a highly exergonic reaction in thepathway of glycolysis that is catalyzed by pyruvate kinase.
Detailed explanation-2: -Thus, the hydrolysis of PEP to form pyruvate is a very exergonic reaction.
Detailed explanation-3: -The products of this reaction are the six-carbon molecule citrate and free co-enzyme A. This step is considered irreversible because it is so highly exergonic.
Detailed explanation-4: -The gluconeogenesis pathway is highly endergonic until it is coupled to the hydrolysis of ATP or GTP, effectively making the process exergonic. For example, the pathway leading from pyruvate to glucose-6-phosphate requires 4 molecules of ATP and 2 molecules of GTP to proceed spontaneously.