BIOB10H3 Lecture Notes - Lecture 9: Immunoglobulin Light Chain, Golgi Apparatus, Inner Membrane

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limerhinoceros831

17 Jun 2011

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What is the cytoskeleton: f luid matrix surrounding organelles, extensive protein network. Proteins translated in cytosol and stay there by default : some examples: Clathrin and cop proteins : proteins outside of the vesicles. Made on free ribosomes in the cytoplasm, no targeting sequence: three main components, microtubules, actin, intermediate filaments. Cytoskeleton -functions: scaffold structural support and cell shape, i n ternal framework organize organelles within a cell, movement directs cellular locomotion and movement of materials within the cell, machinery for cell division, structure and support. Intracellular transport: contractility and motility, spatial organization. Structure: hollow, cylindrical, set of globular proteins arranged in rows : profilaments, contain 13 proto filaments. A- and b- tubulin subunits: subunits polymerize to make microtubules, b- tubulin binds gtp to allow polymerization, polymerize into proto filament. 13 proto filaments arrange around a hollow core and forms the microtubule = entire rod like structure. Protofilament = strings of those alpha beta www. notesolution. com.

Related Questions

Without a cytoskeleton eukaryotic cells would not be able to carry out many essential processes including cell division. Which of the following statements is true?

a. Cells that do not divide as they are in G0 phase, no longer need to produce microtubules

b. Microtubules are the smallest type of cytoskeleton element

c. During cell division, the mid-body organizes the microtubules that attach to the chromosomes

d. Transport proteins can move along microtubules to move vesicles around the cell

e. Because the subunits of microtubules already contain GTP, transport proteins do not require ATP to power their movement

Which of the following statements about the cytoskeleton istrue?
1. Transport vesicles among the membranes of the endomembranesystem produce the cytoskeleton.
2. Microfilaments are structurally rigid and resist compression,while microtubules resist tension (stretching).
3. Chemicals that block the assembly of the cytoskeleton wouldcause little effect on the cell's metabolism
4. The dynamic aspect of cytoskeletal function is made possible bythe assembly and disassembly of a large number of complex proteinsinto larger aggregates.
5. Movement of cilia and flagella is the result of motor proteinscausing microtubules to move relative to each other.

Indicate whether each statement is true or False.

1. The cytoplasm contains all of the material inside of the plasma membrane.

2. The cytosol is the fluid portion of the cytoplasm, which contains the cytoskeleton and cytoplasmic inclusions.

3. The cytoskeleton supports the cell and holds the nucleus and other organelles in place.

4. The cytoskeleton consists of 3 groups of Carbohydrates: microtubules, actin filaments, and intermediate filaments.

5. Cytoplasmic inclusions of the cytoplasm can be aggregates of chemicals either produced or taken in by the cell.

BIOB10H3 Lecture Notes - Lecture 9: Immunoglobulin Light Chain, Golgi Apparatus, Inner Membrane

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