Not ready to purchase the revision kit yet? Nucleoplasm Nucleoplasm is the gelatinous substance within the nuclear envelope. Other examples include the intestinal parasites in the genus Giardiawhich have two nuclei per cell. Inside its fully enclosed nuclear membraneit contains the majority of the cell's genetic material.
Studies on the composition, structure and behaviour of speckles have provided a model for understanding the functional compartmentalization of the nucleus and the organization of the gene-expression machinery  splicing snRNPs   and other splicing proteins necessary for pre-mRNA processing.
Nucleolus produces ribosomes and are known as protein factories.
References 1. As with the other cell organelles of eukaryotic organisms, the nucleus is a membrane-bound organelle. Ferguson M, Ward DC.
EMBO J ; 4: — The nuclear envelope is connected with the endoplasmic reticulum ER in such a way that the internal compartment of the nuclear envelope is continuous with the lumen of the ER. We provide detailed revision materials for A-Level Biology students and teachers.
Associations between distinct premRNA splicing components and the cell nucleus. Pre-replicative association of multiple replicative enzyme activities with the nuclear matrix during rat liver regeneration.