Which process is incorrectly described as ejecting biomacromolecules from the cell?

Exocytosis is the correct process that is responsible for the ejection of biomacromolecules from the cell. It involves the fusion of vesicles containing these macromolecules with the plasma membrane, leading to their release into the extracellular space. This process is essential for various cellular functions, including the secretion of hormones, neurotransmitters, and enzymes.

In contrast, endocytosis refers to the process by which cells internalize substances from their external environment, rather than eject them. This can involve the engulfing of particles or liquids but is fundamentally about bringing materials into the cell, not releasing them.

Pinocytosis is a specific type of endocytosis where the cell ingests extracellular fluid and dissolved substances, further emphasizing the internalization rather than ejection. Similarly, phagocytosis is another form of endocytosis, specifically involving the ingestion of larger particles or microorganisms.

These distinctions clearly illustrate why endocytosis, along with pinocytosis and phagocytosis, does not involve the expulsion of biomacromolecules, making the identification of exocytosis as the correct answer.