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ATP. powers cellular work by coupling exergonic reactions to endergonic reactions. a cell does 3 kinds of work: chemical, transport, mechanical. To do work, cells manage energy resources. by energy coupling. ATP is composed of. ribose, adenine, and three phosphate groups. Hydrolysis.
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couple reaction that consists of TWO reactions. Requires 27 kJ + hydrolysis of ATP releases 30 kJ so it works out. first reaction: glucose is phosphorylated + becomes the shared intermediate. this is energy releasing because ATP is that unstable w/ its 3 phosphates. second reaction: glucose-P reacts w/ fructose - > sucrose. this releases energy ...
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Cells couple the exergonic reaction of ATP hydrolysis with the endergonic reactions of cellular processes. For example, transmembrane ion pumps in nerve cells use the energy from ATP to pump ions across the cell membrane and generate an action potential.
ATP in reaction coupling. When reaction coupling involves ATP, the shared intermediate is often a phosphorylated molecule (a molecule to which one of the phosphate groups of ATP has been attached). As an example of how this works, let’s look at the formation of sucrose, or table sugar, from glucose and fructose 3, 4 .
The reactions are complex, but each of them is driven by a series of individual reactions linked by common intermediates. Now you might be asking: if \(\mathrm{ATP}\) is so unstable, how does it get formed in the first place and how can it be found at such high concentrations?
