Question 36

Mitochondrion is the major site of metabolic processes that provide energy for cellular activities.

Mitochondria are known as the powerhouses of the cell, as they are the primary sites for cellular respiration, where metabolic processes convert nutrients into energy in the form of ATP.

A) Mitochondrion

This option is correct because mitochondria are essential for energy production within the cell. They facilitate the processes of oxidative phosphorylation and the Krebs cycle, which are critical for generating ATP, the energy currency of the cell.

B) Nucleus

The nucleus is involved in storing genetic information and regulating gene expression, but it is not the site for metabolic processes that generate energy. Hence, it does not play a direct role in energy production.

C) Cell wall

The cell wall provides structural support and protection to the cell but does not participate in metabolic activities or energy production. It is an external structure that is not involved in cellular metabolism.

D) Vacuole

Vacuoles are primarily involved in storage and maintaining turgor pressure within plant cells. While they can play roles in certain metabolic processes, they are not the main site for energy production like mitochondria.

Conclusion

The mitochondrion is definitively the correct answer as it is the primary site for ATP production through metabolic processes. In contrast, the nucleus, cell wall, and vacuole serve different functions that do not directly contribute to the energy generation necessary for cellular activities.