What is metabolic coupling?

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Multiple Choice

What is metabolic coupling?

Metabolic coupling is the process by which an energy-demanding reaction is driven by pairing it with an energy-releasing reaction, using energy carriers like ATP, NADH, or a proton motive force to transfer the energy from the favorable step to the unfavorable one. This allows endergonic processes (those that require energy) to proceed because the energy released in a separate, downhill reaction is captured and delivered where it’s needed. For example, ATP hydrolysis provides the energy to power biosynthetic steps and active transport, with the energy often generated by breakdown of nutrients in glycolysis and respiration. The energy carriers shuttle energy between reactions, ensuring that difficult steps can occur within the same metabolic flow. The option that describes linking energy-releasing reactions to energy-requiring reactions using energy carriers is the correct way to capture this idea. The other statements describe processes that don’t involve coupling of endergonic and exergonic steps through energy carriers, such as breakdown without energy input, ATP synthesis without energy input, or ion transport without energy use.

Metabolic coupling is the process by which an energy-demanding reaction is driven by pairing it with an energy-releasing reaction, using energy carriers like ATP, NADH, or a proton motive force to transfer the energy from the favorable step to the unfavorable one. This allows endergonic processes (those that require energy) to proceed because the energy released in a separate, downhill reaction is captured and delivered where it’s needed. For example, ATP hydrolysis provides the energy to power biosynthetic steps and active transport, with the energy often generated by breakdown of nutrients in glycolysis and respiration. The energy carriers shuttle energy between reactions, ensuring that difficult steps can occur within the same metabolic flow.

The option that describes linking energy-releasing reactions to energy-requiring reactions using energy carriers is the correct way to capture this idea. The other statements describe processes that don’t involve coupling of endergonic and exergonic steps through energy carriers, such as breakdown without energy input, ATP synthesis without energy input, or ion transport without energy use.

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