By what endocytosis process do some white blood cells engulf bacteria?

• A. Receptor-mediated endocytosis
• B. Exocytosis
• C. Pinocytosis
• D. Phagocytosis

Answer: (D)

Verified step by step guidance

1. Understand the concept of endocytosis: Endocytosis is a cellular process in which substances are brought into the cell. It involves the engulfing of external materials by the cell membrane, forming a vesicle.
2. Identify the types of endocytosis: There are several types of endocytosis, including phagocytosis, pinocytosis, and receptor-mediated endocytosis. Each type serves a different function and involves different mechanisms.
3. Define phagocytosis: Phagocytosis is a type of endocytosis where cells, such as white blood cells, engulf large particles or microorganisms like bacteria. It is often referred to as 'cell eating.'
4. Differentiate phagocytosis from other types: Unlike pinocytosis, which involves the ingestion of liquid and small particles, phagocytosis targets larger particles. Receptor-mediated endocytosis is more specific, involving receptors to capture specific molecules.
5. Apply the concept to the problem: Recognize that white blood cells use phagocytosis to engulf bacteria, as this process is designed to handle large particles and pathogens, aiding in the immune response.