Final answer:
The nuclear lamina is a network of protein fibers that lines the inner wall of the nuclear envelope, providing structural support for the nucleus and attachment sites for chromatin. It may also play a role in gene regulation.
Step-by-step explanation:
The structure that lines the inner wall of the nuclear envelope and provides structural support for the nucleus is called the nuclear lamina. It is a network of protein fibers, mainly lamins, that form a meshwork just inside the nuclear envelope. The nuclear lamina also serves as attachment sites for chromatin.
In addition to its structural role, the nuclear lamina may have a role in gene regulation. It has been found to interact with certain transcription factors and plays a role in regulating gene expression.
In summary, the nuclear lamina is an important component of the nucleus that provides structural support and attachment sites for chromatin. Its role in gene regulation adds another layer of complexity to its function within the cell.