The Cell Nucleus

The Cell Nucleus

Pedro Marroquin, Gabriel Reyna

Group.108

10/16/2009

Introduction Let’s think of the nucleus as the brain of the cell. It direct all activity in the cell for example it controls movement, reproduction, etc and is the largest organelle in the cell. The nucleus is mostly in the center of the cell but it can be somewhere in the middle of all of the cytoplasm.

The nucleus is surroundedby a nuclear membrane for protection of the other parts of the cell

Nucleolus

The Nucleus also have a Nucleolus, which is a secondary organelle. Which administrate subunits that combine to form ribosomes. This organelle can change its size according to ribosomal requirements. So if a cell that produce large amounts of protein, call for significant numbers of ribosomes, and this demand the nucleoli to have a bigger size.

Chromatin The nucleus also contain chromatin which is a tiny granular material that contains like long lines or “strands” that carry DNA and proteins.

Now since not all cells have nucleus, Biology have divided the cells in eukaryotic, which are the ones with nucleus, and prokaryotic, which do not have a nucleus. The difference is that in prokaryotic cells the DNA is floating in an area called: nucleoid, and in eukaryotic the DNA is in the chromatin inside the nucleus.

When a cell divides, the chromatin condenses to form chromosomes, which are an organize structure of DNA and protein, this information is move “from one generation of cells to the next”.

So if you take the nucleus out of one cell and put it into a different cell, the new cell will follow the instructions of the new DNA inserted and become exactly like the old cell, this is how the scientist clone.