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Because it's an "uphill" reaction. Phosphate groups are negatively charged so they don't easily go together.

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Q: Why must energy be added to ADP and a Phosphate group to form ATP?
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When is energy released from ATP?

( a phosphate group is removed.) when the chemical bond between the second and third phosphate groups is broken, creating adenosine diphosphate, a phosphate group, and releasing energy.


Where does the energy add a phosphate group to ADP to form ATP come from?

Energy is needed to add a third phosphate group to ADP to make ATP. What is a cell's source of this energy?


What is the highest energy from of adenosine?

The highest energy form of adenosine is the one that has the most phosphate group.


Discuss ATP as an energy currency?

ATP releases loses a phosphate group to form ADP-- this releases energy. ADP regains a phosphate group to form ATP-- this takes in energy. ATP breakdown and formation cycle through the metabolic processes providing energy where needed and taking it back in when it can be spared.


What is needed to add a third phosphate group to ADP to make ATP?

ATP synthase


What are ATP ADP and AMP?

Adenosine triphosphate (ATP) is a high energy molecule with 3 phosphate groups that a cell uses to extract and store energy from other molecules such as carbohydrates.Adenosine diphosphate (ADP) is a low-energy molecule that is one phosphate group less of an ATP molecule. ADP chemically bonds with a phosphate group to form ATP to function as such.Adenosine monophosphate (AMP) is simply the adenosine molecule bonded to only one phosphate group.


What happens when ADP gains a phosphate to form ATP?

ATP or adenosine triphosphate. When ADP, adenosine diphosphate, gets a third phosphate group, it becomes ATP. ATP is the energy source of many reactions in the cell. When a reaction needs energy to occur, the enzyme that catalyzes the reaction also cleaves a molecule of ATP into ADP and phosphate. The energy of the phosphate bond is used to fuel the endothermic reaction. The ATP is regenerated (phosphorylation of ADP) in the glycolysis or another process that generates energy.


What combines with a phosphate group to form ATP?

combines with p to form atp


Compare and contrast ATP and ADP?

The purpose of ATP is to store energy. ATP stands for adenosine tri-phosphate, and the energy is mostly stored in the third phosphate bond. ATP is used by cells 24/7 as a form of energy. The purpose of ADP is to have to potential to store energy. ADP stands for adenosine di-phosphate, and when another phosphate is added onto the molecule it is called ATP and will store energy. When ATP releases energy the third phosphate comes off and it becomes ADP.


What is the main function of phosphate?

for energy, form teeth and bones


What molecules with two fatty acid chains and a phosphate group that form biological membranes?

A phospholipid has 2 fatty acid chains and a phosphate group.


Why is phosphorus important in cellular respiration?

The end product of cellular respiration, Atp - Adenosine tri-phosphate, stores energy in the form of a phosphate - phosphate - phosphate bond.