Wich organelle converts the chemical energy stored in food into compounds that are more convenient for the cell to use a. chloroplast b. golbgi apparatus c. endoplasmic recticulum d. mitochondrion

Correct answer is D: mitochondrion

Explanation:

In mitochondrion respiration takes place.  

In this process, that occurs in presence of oxygen, energy is obtained from pyruvate. Glucose is a key product from food and has chemical energy stored. Pyruvate comes from glucose degradation in cytosol and gets into the mitochondrion. There, it is degraded and electrons are transported from a membrane protein to another one until they reach the oxygen and form H2O. While this occurs, a H+ (proton) gradient is generated at both sides of the internal mitochondrion membrane and this potential is finally used to synthesize ATP (available energy for the cell).  

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