Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
Microtubules are arranged in the form of microtubule organizing centers. They are structures found in eukaryotic cells. During interphase, most animal cells consist of microtubule-organizing centers. Several proteins are bound to microtubules, namely dynein and kinesin.
Microtubules are composed of subunits called tubulin. Each tubulin is made of alpha and beta-tubulin joined together. Tubulin is a heterodimer.
Microtubules play a crucial part in all eukaryotic cells for the proper function and survival of the cells. These cells release the protein tubulin in a normal way that involves transcription of the gene encoding tubulin, which provides RNA, followed by transcription of mRNA to produce proteins. The lumen is the inner space of a hollow cylinder of microtubules.
Component of microtubules - Microtubules are composed of a number of different filamentous proteins, microtubules are composed of a single type of globular protein called tubulin. Tubulin is a dimer consisting of two closely related 55kD polypeptides, α-tubulin and β-tubulin.
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