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Chapter 20
Cell Biology
| Term | Definition |
|---|---|
| Extracellular Matrix (ECM) | Complex network of polysaccharide and proteins secreted by cells such as cellulose and collagen that form a structural support |
| Tissue | An assembly of cells and matrix woven together to form a distinctive multicellular fabric with a specific function |
| Cellulose | Structural polysaccharide consisting of long chains of covalently linked glucose units. Provides tensile strength in plant cell walls |
| Collagen | Triple stranded fibrous protein that is a major component of the Extracellular matrix and connective tissues |
| Proteoglycan | Molecule consisting of one or more glycosaminoglycan chains attached to a core protein; regulate the passage of molecules through the Extracellular medium and guide cell migration |
| Glycosaminoglycan (GAG) | Polysaccharide chain that can form a gel that acts as a space filler in the Extracellular matrix of connective tissues; helps animal tissues resist compression |
| Stem Cells | Relatively undifferentiated self renewing cell that produces daughter cells that can either differentiate into more specialized cell types or can retain the developmental potential of the parent cell |
| Cloning | The process of creating an exact copy of a biological unit from which it was derived |
| Reproductive cloning | The artificial production of genetically identical copies of an animal by for example transplantation of a somatic cell nucleus into an enucleated fertilized egg |
| Therapeutic Cloning | Procedure that uses nuclear transplantation to generate cells for tissue repair and other purposes as opposed to producing whole multicellular individuals |
| Induced Pluripotent stem cells (IPS) | Somatic cell that has been reprogrammed to resemble and behave like a Pluripotent embryonic stem (ES) cell through the artificial introduction of a set of genes encoding particular transcription regulators |