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 [...]
Cytoplasm: Cell membrane encloses a space with hyloplasm or cytosol, which is the ground substance and sheat of all metabolic activities. Cytoplasm consists of water, protein, including multifunctional enzymes, lipid, carbohydrates, different types of RNA molecules and various smaller molecules. Cytoplasm of bacteria is differentiated into two distinct areas. A less electron dense nuclear material and a dark region. In [...]
The most metabolites can readily pass through the outer mitochondrial membrane. In contrast, the inner membrane is not freely permeable. Except in special cases, sugars cannot pass through the membrane. Ions such as Na+, K+, and CI- are impermeable as are NAD+, NADH, NADP+, NADPH, AMP, CDP, GDP, CTP, GTP, CoA, and acetyl-CoA. These compounds collect in the matrix and [...]