Question

Adenosine diphosphate contains
(a) one high energy bond
(b) two high energy bond
(c) three high energy bond
(d) four high energy bond

Answer 1

ADP has only one high energy bond.

Option (a) is correct.

Explanation:

• Adenosine diphosphate (ADP) is made up of two phosphate molecules.
• One phosphorous molecules is attached to adenosine through an ester bond.
• An ester bond is a low energy bond.
• The second phosphorous molecule is attached to the first phosphorous through an acid anhydride bond.
• Acid anhydride bond is a high energy bond because it forms with difficulty.  Thus, ADP has only one high energy bond.
• ATP has two high-energy bonds because it has three phosphate molecules.

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