What do all three types of endocytosis involve?

• A. The breakdown of substances within lysosomes
• B. The engulfing of substances by the cell membrane
• C. The release of substances from the cell
• D. The synthesis of proteins within the cell

Answer: (B)

Verified step by step guidance

1. Understand that endocytosis is a cellular process where cells engulf external substances, bringing them into the cell.
2. Recognize the three types of endocytosis: phagocytosis, pinocytosis, and receptor-mediated endocytosis.
3. Phagocytosis involves the engulfing of large particles or cells, often referred to as 'cell eating.'
4. Pinocytosis is the process of engulfing liquid substances, often called 'cell drinking.'
5. Receptor-mediated endocytosis involves the specific uptake of molecules based on receptor-ligand interactions on the cell membrane.