Certified Clinical Medical Assistant Exam Practice Question

Correct Answer: B

Rationale: Mitochondria are known as the cell's "power plants" because they generate adenosine triphosphate (ATP), the primary energy currency of the cell, through cellular respiration.

In contrast, the nucleus (A) is responsible for storing genetic information and coordinating cellular activities, but it does not produce energy. Lysosomes (C) serve as the cell's waste disposal system, breaking down waste materials and cellular debris, rather than generating energy. The cytoplasm (D) is the fluid that fills the cell and contains organelles, but it does not produce energy itself. Thus, only mitochondria fulfill the role of energy production.