HTHSCI 1H06 Chapter Notes - Chapter 3: Lipid Bilayer, The Fluid, Cytosol
14 Dec 2015
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Document Summary
Is a selectively permeable membrane separating the cell"s internal environment from the external environment: cytoplasm. Consists of all cellular content between plasma membrane and nucleus. Two components: cytosol: fluid, also known as intracellular fluid, organelles: inside cytosol, each has specific shape & function. Large organelle contains most of cell"s dna. In nucleus chromosome(single molecule of dna) contains thousands of genes(hereditary unit) that control aspects of structure and function. Week 2: the plasma membrane flexible yet sturdy best described by using a structural model called the fluid mosaic model. The fluid mosaic model the molecular arrangement resembles a continually moving sea of fluid lipids that contains a mosaic of many different proteins. Membrane lipids allows passage of lipid soluble molecules, but not charged or polar substances. Some proteins float freely and others are anchored at specific locations: some allow for passage of molecules, act as signal receptors, or link plasma membrane to intra/extracellular proteins. Basic structural framework of the plasma membrane.
