Question

Which of the following is the proper name for the bond between phosphate groups (e.g. between the gamma and beta phosphate groups in ATP)?

(A) Anhydride
(B) Hydride
(C) Ester
(D) Phosphodiester

Answer 1

The proper name for the bond between phosphate groups in ATP is phosphoanhydride bond. These high-energy bonds are formed between the second and third phosphate groups and between the first and second phosphate groups in ATP.

Step-by-step explanation:

The proper name for the bond between phosphate groups in ATP is phosphoanhydride bond. ATP is composed of adenosine bound to three phosphate groups. The high-energy bonds are formed between the second and third (or beta and gamma) phosphate groups and between the first and second phosphate groups. These bonds are considered "high-energy" because the products of the bond breaking, adenosine diphosphate (ADP) and one inorganic phosphate group (P₁), have considerably lower free energy than the reactants: ATP and a water molecule.