... Publishing, Inc. 1989 1d Single-membrane structure. The thickness of structure C shows to be only a single membrane cell. Also the structure when compared to other similar looking cells on the diagram, such as structure D, looks less rigid and unstable. I believe structure D to be a double-membrane structure 2a Large molecular structure increases penetration rate 2b Small Number of Hydroxyl groups decrease the penetration rate 2c Low lipid solubility decreases penetration rate 2d The Hydrophilic nature increases penetration rate 3a 3b The cytoskeleton is a network of protein elements that extends through the cytoplasm in eucaryotic cells. Microtubules Microtubules are small cylindrical fibers that change in length by assembling and disassembling. The fibers are lengthened and shortened as they assemble or disassemble from one or both ends. The assembly of microtubules is controlled by an area near the nucleus called the centrosome. The centrosome contains two barrel-shaped structures that are composed of microtubules. These structures, called centrioles, are oriented at ...

See this essay or coursework document in full right now