Cellular and Molecular Biology concepts Speech or Presentation

Cellular and Molecular Biology concepts - Speech or Presentation Example Nucleus is one of the organelles found in the cell that is enclosed with a membrane. It is found in eukaryotic cells (Cech, 2000). Most of the genetic material of the cell is in the nucleus and this genetic material is organized in the form of long linear DNA molecules which are present in multiple numbers. The genetic material are present in complex associations with various proteins, known as histones to form chromosomes. Genes which are present within the chromosomes form the nuclear genome of the cell (Lamond, 1998). The main function of the nucleus is to maintain the integrity of the genes present in the chromosomes and regulate their expression. Thus, it can be said that the organelle, nucleus, is the control center of any cell. The nucleus is covered with a nuclear envelope which is basically a double membrane. The membrane separates the nucleus from other contents present in the cytoplasm. It contains some pores which host channels to facilitate movement of molecules and ions between the nucleus and the cytoplasm. The movement of these molecules is controlled carefully. For the purpose of movement of larger molecules, carriers proteins are present for active transport. The nucleus has a nuclear lamina within itself that provides mechanical support to the various contents of the nucleus.