Which cellular appendage enables cells to move through their environments?

The cell membrane serves as a protective barrier that regulates the entry and exit of substances into and out of the cell. While it plays a crucial role in maintaining cellular integrity and communication, it does not facilitate movement through the environment itself, as it lacks the necessary structures for locomotion.

Transport proteins are integral to the movement of ions and molecules across the cell membrane. Their primary function is to assist in the transport processes, rather than providing motility to the entire cell. Thus, while they are vital for cellular function, they do not enable the cell to move through its environment.

Receptors are proteins located on the cell membrane that receive and transmit signals from the environment, facilitating communication between the cell and its surroundings. However, they do not contribute to the physical movement of the cell; they are primarily involved in signaling pathways and responsiveness to external stimuli.