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Properties of Proteins
Concept Questions
Question #1

All the major elements of the internal structure of a eukaryotic cell are either filaments or tubes that are constructed by combining specialized, identical protein subunits into larger polymers, or chains.

In which of the links below are the different types of "chains" within cells discussed and described?

Link-#12 Link-#63 Link-#81 Link-#44

Question #2

Actin-based filaments can be found almost anywhere inside the cell, however they are most often concentrated around the edges of the cell, just below the surface or plasma membrane. Here they stiffen the liquid contents of the cytoplasm into a cell cortex, and often give the plasma membrane of animals cells its characteristic shape(s).

In which of the links below is there a discussion of thin, pointy extensions or microspikes that extend above the cell surface and in which the actin-based filaments play a big role?

Link-#19 Link-#17 Link-#14 Link-#16

Question #3

There are two major ways in which cells in tissues can be held together; an extracellular matrix of macromolecules can form a lattice-work that can then be used by the associated cells to move, change position and a framework in which cells can interact with one another.

In which of the links below is a second method of holding cells together discussed, and various methods of joining cells described?

Link-#88 Link-#82 Link-#83 Link-#85

Question #4

Junctions between the cells of the epithelium are very important in helping the cells stay together as a sheet of cells (i.e. joining them to one another) and also helping the cells act as a very selective barrier.

Continuous strands of special proteins form a weld between the plasma membranes of two adjacent epithelial cells in such a way as to make a very tight contact between the two sets of plasma membranes, cross the intercellular space, and then seal off the spaces between them totally and completely.

In which of the links below are these types of connections between cells described and explained?

Link-#22 Link-#31 Link-#42 Link-#53

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© 2002, Professor John Blamire