What provides support for cell structure and movement?

The cytoskeleton is a network of protein filaments and tubules that provides structural support to the cell, helping to maintain its shape and organize its internal components. It plays a critical role in cellular movement, including the transport of organelles within the cell, as well as the movement of the entire cell itself, such as in muscle contraction or cell division.

Additionally, the cytoskeleton is involved in various functions like cell signaling and the response to environmental changes. Its dynamic nature allows it to be reorganized as needed, enabling cells to adapt to different conditions or to perform specific functions, such as movement or growth.

In contrast, while the cell wall provides rigidity and support in plant cells, it is not involved in movement. The plasma membrane serves as a barrier that regulates the entry and exit of substances but does not provide structural support in the same way the cytoskeleton does. The nucleus is primarily responsible for storing genetic information and coordinating cell activities, but it does not play a direct role in providing structural support or movement within the cell.