PLS 312 Lecture Notes - Lecture 1: Nucleolus Organizer Region, Nuclear Membrane, Cell Nucleus
1 Nov 2018
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Document Summary
Cell structure is closely tied to genetic function. Glycocalyx or cell coat is a covering over the plasma membrane: consisting of glycoproteins & polysaccharides, this covering has a chemical composition that differs from comparable structures in either plants or bacteria. Cell wall: the outer covering of plant cells: major component is a polysaccharide called cellulous. Various receptor molecules are also found on the surface of cells: these molecules act as recognition sites that transfer specific chemical signals across the cell membrane into the cell. Also present in the nucleus is the nucleolus, an amorphous component where ribosomal. Rna (rrna) is synthesized & where the initial stages of ribosomal assembly occur. The portions of dna that encode rrna are collectively referred to as the nucleolus organizer region or the nor. The remainder of the eukaryotic cell within the plasma membrane, excluding the nucleus, is referred to as the cytoplasm & includes a variety of extra-nuclear cellular organelles.
