The nucleus "The brain"
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The nucleus is like the "brain" of the cell. It manages and controls a lot of things that happens in the cell. Not every cell needs a nucleus though, eukaryotes cells have nuclei and prokaryotes do not. The nucleus is so important that it has multiples parts to it.
Chromatin/chromosomes
Chromatin is what makes up chromosomes. It contains DNA, RNA, and proteins which condenses very long strands of DNA to fit into the cell. It can be found all around the nucleus and turns into a chromosome when it condenses during a process named mitosis, which is a type of cell division. Chromosomes contain genes which have very specific information to create a protein and create us into who we are.
Nuclear envelope
The nuclear envelope is the membrane of the nucleus. The membrane has pores that regulate what comes in and out of the nucleus. It has an inner and outer membrane. These two membrane separate the nucleus from the cytoplasm and keep all of its contents together.
Nucleolus
The nucleolus is the largest part of the nucleus. It is made up of RNA, DNA, and proteins. It's main purpose is to create ribosomes, which also aids in creating proteins.
Ribosomes "Construction workers"
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Ribosomes are the main creators of proteins. They are like the construction workers of the cell because protein is the base of mostly everything. They can be found in the cytosol or on the rough ER. Ribosomes takes messenger RNA, which contain the genetic information for the protein, and the transport RNA, which transport the amino acid also needed to create the protein. After the ribosome makes the protein, the protein is transported to the Golgi Apparatus which packages and sends out the protein.