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Cell Wall and Intercellular Junctions

An incredibly exciting adventure into the perilous unknown, the cell wall. You'll laugh and cry; then you'll rejoice when it ends... if you survive,

Johnathan Nowakowski

on 19 October 2012

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Transcript of Cell Wall and Intercellular Junctions

Cell Wall
Junctions Shourik and
Johnathan Agenda The Glorious Cell Wall Functions of the cell wall MAking the cell Wall Primary Cell Wall Structure of the Cell Wall 1) Cell Wall- Function and Structure
2) Making the Cell Wall
3)Quick Review
4) Guest Speaker!!!
5) Overview of Interceulluar Juntions
6) Types of Junctions
7) REd Rover
8) Quiz An extracellular structure of characteristic of plant cells
Cell walls are a rigid layer of polysaccharides lying outside the cell membrane
Found in prokaryotes, fungi, and some protists too protects the cell from leakage and hypotonic explosion
prevents excessive intake of water
maintains cell shape
make the stem of the plant rigid; holds plant up
like skeletal system in vertebrates Middle Lamella Do animal cells have cell walls? Lets ask
biology expert Dr. Scott of Penn St. Quick Review And you though cell walls were fun... Intercellular Junctions -Cell walls are perforated with channels
called plasmodesmata. Intercellular junctions
and cell walls -Cytosol-the plasma in the cell- passes through the
plasmodesmataand connects the
chemical enviornment of the cell. Importance In animal, there are three main types of junction:
-Tight Junctions
-Desmosomes(Anchoring Junctions)
-Gap Junctions(Communicating Junctions) Types of Intercellular Junctions -An intercellular junction that prevents the leakage between cells. Tight Junctions -Acts as a rivet; fastens cells together in strong sheets. Desmosomes(Anchoring Junctions) -Provides channels from one cell to another
-Similar to plasmodesmata in plants.
-Consists of membrane proteins that surround a pore. Gap (communicating Junctions) "Mr. Gorbachev,
tear down
this cell wall!" "Sorry old chap,
that cell wall
is as tough
as iron, like me!" cell wall thicker than cell membrane
chemical composition of the cell varies by plant or cell type
made up of micro fibrils
cellulose synathase produce polysaccharide cellulose; this makes up the microfibrils relatively thin and flexible wall secreted by growing cell
microtubles help orient fibrils
cellulose fibrils guide direction of cell expansion

Ehrhardt- microtubles affect on fibrils
microtubules guide cellulose synthase while it deposits proteins, thus affecting growth patterns. made of pectin
a thin layer rich in sticky polysaccharides
acts as a glue
strenghthens the wall as cell matures Secondary cell wall provides majority of protection and support
made of stronger polysaccharide matrix
commonly perforated by channels called plasmodea Cells are organized into tissues, organs, and organ systems. basic info Cells communicate and interact
through direct physical contact. -Plasmodesma (plural=plasmodesmata) is an open channel in the cell wall of a plant through which strands of cytosol connect from an adjacent cell. -The plant, through these "channels" is unified into a living continuum. -Bound by specific proteins -These junctions form continous seals around the cell. -Intermediate filaments made of sturdy keratin proteins anchor desmosomes in the cytoplasm. Questions! 1) Which intercellular junction is similar to plasmodesma? Explain
2)What is the critical monomer that helps make up the cell wall? We have learned this
3) what is the difference between Tight Junctions and Desmosomes
4) what are the 3 basic components of a cell wall?
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