Question

Choose the correct answers from the alternatives given .
ATP is considered a high-energy compound because under cellular conditions, 7.3 kcal per mole of energy is released when a bond is broken between the

• A. base adenine and the sugar ribose
• B. adenosine and the phosphate groups
• C. base adenine and the phosphate groups
• D. adenosine diphosphate and the third phosphate

Answer 1

The correct option is D adenosine diphosphate and the third phosphate

Energy is stored in the covalent bonds between each phosphate group which makes up the tail of the molecule. The last phosphate bond holds the most energy (approx. 7.3 kcal/mole). It is called the pyrophosphate bond. In order to release it's energy to the body, ATP breaks down into ADP [Adenosine Diphosphate(2 phosphates)] and an inorganic phosphate group and releases energy from the pyrophosphate bond.

So, the correct option is 'Adenosine diphosphate and the third phosphate'.