A cell pump hormones out into the bloodstream; a process that requires energy. If 4 ATP were converted to ADP, how much energy was used

The question lacks options, the options are;

A) 4 KJ

B) 122 KJ

C) 30.5 KJ

D) 1600 KJ

The answer is B, 122KJ

Explanation:

Adenosine triphosphate (ATP) is the energy currency of all living cells. It is the usable form of energy by cells for their life functions. Energy in ATP is harnessed via the hydrolysis of one of its phosphate molecules to form Adenosine diphosphate (ADP). The energy (measured in Kilojoules) needed by cells is released in this process.

In this case, a cell uses energy to pump hormones into the bloodstream. According to the question, 4 ATP's were used i.e. 4 ATP were converted to ADP. The hydrolysis of one ATP molecule releases 30.5 KJ/mol of energy needed for cellular work.

Hence, if 4 ATP were utilized by this particular cell, 4 × 30.5 KJ = 122 KJ of energy will be used by the cell to pump hormones.