Question 33

Cells need to use exocytosis to eliminate waste.

Exocytosis is a process that allows cells to expel waste products, making it essential for maintaining cellular health and homeostasis. By removing unwanted substances, cells can function more effectively and prevent toxicity.

A) To obtain energy

This option is incorrect because exocytosis does not play a role in energy acquisition. Cells typically obtain energy through processes such as cellular respiration or photosynthesis, not by expelling materials.

B) To defend against invaders

While cells do have mechanisms to defend against invaders, exocytosis specifically is not primarily used for this purpose. Immune responses often involve other processes such as phagocytosis or the release of antibodies rather than exocytosis.

C) To eliminate waste

This is the correct answer, as exocytosis is a vital process for expelling waste materials from the cell. By packaging waste in vesicles and transporting them to the cell membrane for release, cells effectively manage their internal environment.

D) To undergo cell division

Exocytosis is not directly involved in the process of cell division. Instead, cell division involves other complex mechanisms such as mitosis and cytokinesis, which do not rely on the exocytotic pathway.

Conclusion

Exocytosis is crucial for cells to eliminate waste, ensuring they remain functional and healthy. Options A, B, and D fail to reflect the primary role of exocytosis, which is specifically to expel waste, making C the definitive correct choice.