The following points highlight the three main classes of protein fibers in cytoskeleton. The classes are: 1. Microtubules 2. Actin Filaments 3. Intermediate Filaments. Protein Fibers in Cytoskeleton: Class # 1. Microtubules: Microtubules are long thread-like structures measuring about 25 nm in diameter; their length varies up to several millimeters. Microtubules have the following two main properties: (i) Long and [...]
In this article we will discuss about the Plasma Membrane:- 1. Subject Matter of the Plasma Membrane 2. Chemical Composition of Plasma Membrane 3. Specialized Structure 4. Functions. Subject Matter of the Plasma Membrane: The protoplasm of the cell is bounded by an exceedingly thin elastic, semi-permeable living limiting membrane called the plasmalemma or plasma membrane or cytoplasmic membrane or [...]
The following points highlight the top two types of membrane models. The types are: 1. Lamellar Models 2. Micellar or Sub-Unit Models. Membrane Models: Type # 1. Lamellar Models: (I) Lipid Bilayer Hypothesis: Overton (1895) suggested that the cell membranes contain lipids. This conclusion was based on the fact that fat solvents dissolved the membrane easily and fat soluble substances [...]