Final answer:
Both unicellular and multicellular organisms use endocytosis for taking in materials, which is true. In unicellular organisms like amoeba, it is used for ingestion and digestion of food, while in multicellular organisms, it is also used for nutrient uptake and cellular signaling.
The answer is true
Step-by-step explanation:
Unicellular and multicellular organisms both utilize endocytosis as a means of taking in materials from their environment. In unicellular organisms like the amoeba, endocytosis is used for ingesting food. The food vesicle then fuses with a lysosome, which contains digestive enzymes, to digest the food. Once digested, waste is excreted through exocytosis. This process is essential not just for nutrition but also for other cellular processes.
In multicellular organisms, endocytosis plays a crucial role in nutrient uptake, as well as in cellular signaling through receptor-mediated endocytosis. This type of endocytosis is highly selective and involves the cell taking in specific molecules when they bind to receptors on the cell membrane.
Thus, it's clear that the statement is true: both unicellular and multicellular organisms use endocytosis as part of their cellular function.