Unformatted text preview: provides initial trigger for apoptosis. C. SMOOTH ENDOPLASMIC RETICULUM i) An extension of the outer bilayer of the nuclear envelope, it is located between the nucleus and the ERGIC. It is composed of a network of tubular lipid bilayer compartments and enzymes. ii) It is the site of lipid and sterol synthesis and the detoxification (enzymatic oxidation) of xenobiotics. Also, serves as a storage site for free Ca++. D. MICROTUBULES (MTs) i) Located in the cytoplasm as part of the cytoskeleton and in the nucleus of mitotic cells as part of the mitotic spindle. Composed of polymerized proto-filaments of alpha and beta tubulin proteins. ii) In cytoplasm, serves to establish and maintain cell shape. Provides polar tracks for guiding transport of intracellular cargos. In the nucleus, captures chromosomes for mitosis and is involved in orienting the spindle apparatus....
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- Fall '10
- Mitosis, Cell nucleus, lipid bilayer membrane, lipid bilayer compartments