Multiple Choice
Enzyme responsible for decarboxylation and phosphate transfer in the same gluconeogenic reaction is:
22. Carbohydrate Metabolism
Gluconeogenesis
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Which molecule is added to pyruvate and then removed in the next reaction?
A
H+
B
H2O
C
PO32-
D
CO2
Verified step by step guidance1
Understand the context: Pyruvate is a key intermediate in several metabolic pathways, including glycolysis and the citric acid cycle.
Identify the process: In the citric acid cycle, pyruvate undergoes a series of reactions to be converted into acetyl-CoA.
Recognize the role of CO2: During the conversion of pyruvate to acetyl-CoA, a decarboxylation reaction occurs where a carboxyl group is removed from pyruvate as CO2.
Clarify the reaction: The enzyme pyruvate dehydrogenase catalyzes the reaction where pyruvate (3-carbon molecule) loses a carbon in the form of CO2, resulting in a 2-carbon acetyl group.
Conclude the step: The CO2 is the molecule that is removed from pyruvate during its conversion to acetyl-CoA, which is a crucial step in cellular respiration.
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