Answer :
Final answer:
Metabolic pathways involving glucose metabolism can produce NADH, NADPH, or both. A) The EMP pathway produces NADH, the ED pathway produces both NADH and NADPH, and the PPP pathway produces NADPH.
Explanation:
In terms of glucose metabolism, different metabolic pathways produce NADH, NADPH, or both. Three related pathways that play a significant role in this process are the Embden-Meyerhof-Parnas (EMP) pathway, the Entner-Doudoroff (ED) pathway, and the pentose phosphate pathway (PPP).
The EMP pathway, also known as glycolysis, specifically produces NADH during the energy payoff phase by oxidizing glyceraldehyde 3-phosphate (G3P) to pyruvate. An alternative to the EMP pathway is the ED pathway, which is used by certain prokaryotes. The ED pathway produces both NADH and NADPH, contributing to the pool of energy-carrying molecules. Lastly, the PPP pathway serves to generate both five-carbon sugars, as well as NADPH, a key coenzyme in anabolic reactions.
Therefore, based on the given options, option A) EMP pathway: Only NADH; ED pathway: Both NADH and NADPH; PPP pathway: Only NADPH, seems to align most accurately with the role of these metabolic pathways in the production of NADH and NADPH.
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