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What is signal transduction essential for?
cell to cell communication
In multicellular organisms, intercellular signals are responsible for..
creating an integrated whole from many thousands of independent parts
What is plant cell wall composed off?
cellulose fibers embedded in pectin
What does the cellulose fibers embedded in plant cell wall help out with?
deal with high turgor pressure inside cells
What are pectin made up off?
polysaccharrides that are hydrophyllic
history of word pectin
- greek word pektose
- *means solid
How many molecules make up collagen molecules?
3 chains that wind around each other
Are there many collagen molecules inside each collage fibril?
How does scurvy occur?
lack of vitamin C thus lack of collagen
Why does lack of collagen cause scurvy?
there is no way to anchor capillaries
(type of cell-cell connection) tight junctions (2)
-forms a seal between cells
-extracellular fluids and components have tough time getting between cells
(type of cell-cell connection) Desmosome
-type of cell-cell attachment structure consisting of cadherin proteins that bind the cytoskeletons of adjacent animal cells together
(type of cell-cell connection) Plasmodesmata (2)
-create gaps tht connect plant cells
-physical connection between 2 plant cells consisting of gaps in the cell walls through which the 2 cells plasma membranes, cytoplasm, and smooth ER can connect directly
Functionally, what do plasmodesmata resemble in animal cells?
(type of cell-cell connection) Gap junctions
-type a cell-cell attachment structure tht directly connects the cytoplasm of adjacent animal cells allowing passage of water,ions,and small molecules between the cells
Whats the most important feature in gap junctions?
the direct connection between cytoplasm of cells not the gaps
Where did gap junctions get there name from?
name comes from the space that one can see between the cells using electron microscopy
(type of cell-cell connection) Seals cells together?
(type of cell-cell connection) Connect the cytoskeleton of cells?
(type of cell-cell connection) Acts as channels between cells?
What do they mean that a cell has polarity? (2)
- the top of cell is different than the sides and bottom
- *it has different proteins thus different functions
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