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Transcript
Nucleolus By: Tiffany Kim #19 MJ Lewis #20 What is the nucleolus? The nucleolus is an organelle that is a nonmembrane bound structure composed of proteins and nucleic acids. It resides within a eukaryotic cell's nucleus and is concentrated in the area of RNA production. The nucleolus contains the hereditary information for reproducing. Where is it located? The nucleolus is found directly inside of the nucleus, hence the name "nucleolus". Since the nucleus is the controlling part of the cell, many confuse that the nucleolus ALSO controls the cell due to its location. Although, that is incorrect because the nucleolus has its own part in the cell process. What does it look like? The nucleolus does not have any unique or special appearance compared to the nucleus or any other organelle in the cell. It is simply just a smaller aspect within the nucleus. Although, a nucleoplasm, a jelly-like substance like the cytoplasm, surrounds the nucleolus. How many are of this organelle? The average human body is known to have about 1.3 trillion animal cells, leading to the same amount of a nucleolus. But adding on bacteria and similar cells to germs, there are about 100,000,000,000,000 cells in an animal and/or human. Although, in some cases (due to certain situations), the amount of a nucleolus can be smaller than the amount of cells. What does it do? The nucleolus directs assemblies of proteins within the cell's nucleus. RNA is synthesized and assembled within the nucleolus. Overall, the nucleolus produces ribosomes during interphase, the period of the cell cycle where the nucleus is not undergoing division. What would happen if it were located some where else? The location of the nucleolus is very important in the cell's cycle of processes. It creates proteins, or ribosomes, for the cell, which plays a big part into the human body's system alone. If it were located in another place, nothing would make the ribosomes, and in a chain of events, affect the rest of the cells. What would happen if the nucleolus wasn't there? Every organelle of a cell has its part in the cell cycle, therefore its location plays a big part in it. Since the nucleolus is located in the nucleus, its presence alone helps the nucleus function too. If it were to be removed, the nucleus would not be able to function, therefore, it affects the rest of the cell. Summary of What You Know NOW Interphase is the period of when the nucleus is not going through division. The nucleus could not function without the nucleolus. One missing organelle BONUS FACTS 1. Prokaryotes do not have them 2. They contain chromosomes, holding DNA 3. It's impermeable to most molecules 4. It does not contain any membrane-bound subcompartments 5. It was the second organelle to be discovered 6. It has a double membrane called a nuclear envelope that separates it from the cytoplasm 7. It was found by Franz Bauer 8. Some nuclei may contain more than one nucleoli Extra Images