In this example, the exergonic reaction of ATP hydrolysis is coupled with the endergonic reaction of converting glucose for use in the metabolic pathway. Privacy Policy. Skip to main content. Search for:. ATP: Adenosine Triphosphate. Key Takeaways Key Points Adenosine triphosphate is composed of the nitrogenous base adenine, the five-carbon sugar ribose, and three phosphate groups.
The energy released from the hydrolysis of ATP into ADP is used to perform cellular work, usually by coupling the exergonic reaction of ATP hydrolysis with endergonic reactions.
Sodium-potassium pumps use the energy derived from exergonic ATP hydrolysis to pump sodium and potassium ions across the cell membrane while phosphorylation drives the endergonic reaction. Key Terms energy coupling : Energy coupling occurs when the energy produced by one reaction or system is used to drive another reaction or system. Licenses and Attributions.
CC licensed content, Shared previously. Here's an analogy. Think about lighting a campfire. What do you need? You need fuel the wood , you need heat it's harder to light a fire when it's cold , and you need oxygen because another word for burning is " oxidizing " and, as you might guess, it can only occur in the presence of oxygen.
Oxidizing something causes it to lose electrons, which means that energy the electrons is released when you oxidize, or burn, a fuel. Your food is your fuel. You burn the fuel for energy. You need the oxygen to burn the fuel. This happens in the mitochondria. There are so many bonds here, and many, if not all are covalent.
These types of bonds are very strong, and therefore have a lot of energy in them. So, the energy stored within an ATP molecule is in the form of chemical potential energy. The chemical bond between the second and third phosphate groups is a high energy bond. When that bond is broken, energy is released, producing "ADP" adenosine diphosphate. The energy released is used by the cell to do work. Nam D. Feb 24, Chemical potential energy.
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