How ATP Provides Energy for Cells
ATP stand for adenosine triphosphate, a vital energy molecule that is used by organisms across the world to move muscles and power chemical reactions that sustain life. Technically, ATP is classified as a macromolecule, because of its complex form, which contains the nucleoside adenosine, constructed from the purine adenine and the sugar component ribose. Added to this nucleoside are three phosphates. Organisms use this arrangement to build other necessary molecules, create electrical pulses in nerves, produce effects such as bioluminescence, and many other activities.
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Sources
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Some studies have shown that the average cell in the human body holds about 1 billion ATP molecules at any given time. The cells receive ATP through a complex network that passes the building blocks of the energy molecule throughout the bloodstream. These building blocks are derived from foods consumed by organisms, especially simple sugars such as glucose. Fats are simply a way to store unused carbohydrates, which can be taken apart and used to create more ATP when needed.
Composition
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ATP molecules are high energy, which means that their atoms contain a larger amount of energy and their electrons are at higher levels than most other molecules in the cell. Most of this energy is contained in the bond between the second and third phosphate in what is known as the pyrophosphate bond. This makes it easy for cells to release the energy held by the atoms of ATP: They simply break the bond between the last two phosphates. When the bond is broken, the scattered energy is used immediately to power a necessary process that the cell is completing.
By-products
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What is left after the energy has been used is an inorganic phosphate, the part of the ATP molecule that the cell has broken off, and the old ATP molecule, which is now ADP, a form with far less energy. Many cells have processes to reattach a phosphate to the ADP, recharging the molecule once again making it into ATP.
Chemical Properties
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Generally speaking, ATP releases just the right amount of energy for a cell to perform a necessary biological reaction, so barely any energy is wasted in this process. ATP is also perfectly suited to energy release because of the inherent instability of its bonds, which allow the enzymes of the cells to easily break it apart. On its own, however, ATP tends to stay relatively unbroken, losing little energy through hydrolysis.
Uses
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The energy produce by ATP is used for almost all activities performed by the cell. This includes moving other molecules back and forth through the cell membrane, helping cells act in concert to contract and release muscles, allowing cells to circulate blood, and providing energy cells needs for their many protein-building and chemical construction processes.
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Comments
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this is a good article, it help me alot.
