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What is the nucleus and why is it important?
The nucleus is a pivotal organelle responsible for regulating almost all forms of cellular activities. Mostly, every type of cell that exists is categorized on the basis of the absence or presence of the nucleus within its cell (categorized either as a prokaryotic or eukaryotic cell.) What is a Nucleus?
What is found in the nucleus of a cell?
Thread-like, dense structures known as chromatins are found within the nucleus containing proteins and DNA. The mechanical strength for the nucleus is provided by the nuclear matrix, a network of fibres and filaments which performs functions similar to the cytoskeleton.
How are adjacent nucleosomes connected?
Adjacent nucleosomes are connected via “linker DNA”. The nucleosome is the smallest structural component of chromatin, and is produced through interactions between DNA and histone proteins.
What is the function of the nucleolus in a cell?
The Cell Nucleus. After a cell divides, a nucleolus is formed when chromosomes are brought together into nucleolar organizing regions. During cell division, the nucleolus disappears. Some studies suggest that the nucleolus may be involved with cellular aging and, therefore, may affect the senescence of an organism.
What is the role of nucleus in cell division?
The nucleus is, of course, required for cell division, but it also determines the type of structure which the cell eventually develops into. This has been demonstrated by the German biologist J. Hammerling, using the marine alga Acetabularia. The great advantage of this organism is that although it is a single cell it is unusually large.
What is the function of the nucleolus?
Besides DNA, the nucleus is home to another organelle called the nucleolus, or little nucleus. Under a microscope, the nucleolus appears as a dark area inside the nucleus. The nucleolus is made from DNA that provides the code to make ribosomal RNA. As the name implies, ribosomal RNA is RNA that makes up the ribosomes.