Interphase chromosomes appear to be attached to the nuclear lamina and perhaps also the nuclear matrix. Describe these two structures. See Figure 6.9 and the associated text.

The nucleus is the most prominent cell organelle when viewed through a microscope. The nuclear envelope surrounds it. A nuclear envelope is a complex structure that consists of an inner and outer membrane. A perinuclear space separates both the membranes.

The cell organelle stores the genetic information of the cell. It is also called the control center of the cell.

A network of filaments is found lying against the inner membrane of the envelope. These are referred to as nuclear lamina, which are composed of laminins.The nuclear lamina is known to maintain the shape of the nucleus as it provides mechanical support to the nuclear envelope.

Nuclear lamina serves as the site of attachment for chromatin fibers. It also plays an integral role in the activities of the nucleus, such as cell cycle regulation, DNA replication, gene transcription, and many more.

A network of fibers that form the skeleton of the nucleus is called a nuclear matrix.They are present in the nucleoplasm of the nucleus and are analogous to the cytoskeleton of the cell.

The nuclear matrix includes nuclear lamina, nuclear pores, and ribonucleoprotein network. It is observed as protein fibers extending from the interior of the nucleus.