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Cell biology Lab.3
Cell biology Lab.3

... contour or send out numerous processes . the nerve ...
Cell Organelles
Cell Organelles

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the cell – project - Northview Middle School

... In Science models are used to make complex ideas easier to understand. To demonstrate your knowledge of plant and animal cells you are to construct an annotated 3D model that adheres to the following guidelines. 1. Choose to make a plant or animal cell. ...
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asdfs - The Wesley School

... _______________ DNA is copied and cell prepares to divide ANAPHASE _______________ Chromatid arms separate and move to opposite ends of the cell _______________ TELOPHASE Chromosomes unwind into chromatin & nucleus returns PROPHASE _______________ Nuclear membrane & nucleolus disappear ...
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Cell Biology Practice Question Answers

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... particular function. Organelle means “little organs” because they are like organs in that they have a distinct job. 6. List 4 ways that prokaryotes are different from eukaryotes. 1) Prokaryotes do not have a nucleus and eukaryotes do. 2) Prokaryotes are single celled and eukaryotes can be multicelle ...
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... Retinoic acid (RA) regulates transcription of a series of genes involved in cell proliferation, differentiation and apoptosis by binding to the RA receptor (RAR) and retinoid X receptor (RXR) heterodimers. The cellular retinoic acid-binding protein 2 (CRABP2) is involved in the transport of RA from ...
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Bacteria and Viruses

< 1 ... 445 446 447 448 449 450 451 452 453 ... 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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