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Structure of Prokaryotic & Eukaryotic Cells
Structure of Prokaryotic & Eukaryotic Cells

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doc Answers to Lab 2 Manual

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Domains and kingdoms - Peoria Public Schools

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PSI - Eukaryotes Multiple Choice Review

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Cells and Their Organelles
Cells and Their Organelles

... nucleolus that makes ribosomes. The nucleus controls many of the functions of the cell (by controlling protein synthesis). It also contains DNA assembled into chromosomes. The nucleus is surrounded by the nuclear membrane. Color and label the nucleolus dark purple, the nuclear membrane yellow, and t ...
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... Before the nucleus Nucleoid region (one circular chromosome) Some bacteria carry plasmids (small circles of DNA with non-essential genes like antibiotic resistance) We use plasmids to manipulate cells. No membrane bound organelles Have ribosomes for protein synthesis No internal membrane (all metabo ...
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... mitochondria: make energy for the cell by converting O2 and glucose to CO2, H2O and ATP nucleolus: site of rRNA production and ribosomal subunit assembly in nucleus. nucleus: contains DNA, controls cell activities including cell division. plastids: pigment containing vesicles in plants that function ...
Cells Vocabulary - jeffyoshimura.com
Cells Vocabulary - jeffyoshimura.com

< 1 ... 472 473 474 475 476 477 478 479 480 ... 598 >

Cell nucleus



In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, meaning kernel) is a membrane-enclosed organelle found in eukaryotic cells. Eukaryotes usually have a single nucleus, but a few cell types have no nuclei, and a few others have many.Cell nuclei contain most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes are the cell's nuclear genome. The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression—the nucleus is, therefore, the control center of the cell. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm, and the nucleoskeleton (which includes nuclear lamina), a network within the nucleus that adds mechanical support, much like the cytoskeleton, which supports the cell as a whole.Because the nuclear membrane is impermeable to large molecules, nuclear pores are required that regulate nuclear transport of molecules across the envelope. The pores cross both nuclear membranes, providing a channel through which larger molecules must be actively transported by carrier proteins while allowing free movement of small molecules and ions. Movement of large molecules such as proteins and RNA through the pores is required for both gene expression and the maintenance of chromosomes. The interior of the nucleus does not contain any membrane-bound sub compartments, its contents are not uniform, and a number of sub-nuclear bodies exist, made up of unique proteins, RNA molecules, and particular parts of the chromosomes. The best-known of these is the nucleolus, which is mainly involved in the assembly of ribosomes. After being produced in the nucleolus, ribosomes are exported to the cytoplasm where they translate mRNA.
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