Select all that are true regarding ATP cycling A. ATP is formed from ADP and phosphate

B. Energy for ATP synthesis comes from the oxidation of glucose and other fuel molecules

C. ATP hydrolysis is an endergonic reaction

D. Oxidation of ATP can be used for performing endergonic reactions in the cell

A, B and D are correct

Explanation:

Adenosine diphosphate (ADP) can form a bond with a phosphate group to form Adenosine triphosphate (ATP), which is the most abundant energy carrier molecule in cells. An endergonic reaction is a chemical reaction where there is a net input of energy, while an exergonic reaction generates energy. ATP hydrolysis releases energy (conversely to ATP synthesis that requires an input of free energy), and therefore ATP hydrolysis is an exergonic reaction. ATP hydrolysis releases around 7.3 kilocalories per mole. In a coupled reaction, the energy released by ATP hydrolysis is used by the cell to carry out endergonic reactions in an exergonic manner (e.g., glucose phosphorylation, which is an energetically unfavorable reaction).

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