Eukaryotic cells 3 - Plant cell structures Flashcards
What type of shape does animal cells have
Almost any shape
Plant cells tend to be what shape
Regular and uniform in the appreance
Why are plant cell regular and uniform
cell is bounded by a cell wall
What is the role of the cell wall
strength and support
What is the cell wall made up of
largely insoluable cellouse
What other features does the cell wall have
the cell wall is usually freely permabale to eveything that is dissolved in water - it does not act act as a barrier to substances getting into the cell
How can the cell wall be impregnated
suberin in cork tissues
or with
lingin to produce wood
Which compounds effect the permeability of the cell
suberin or lingin
What is the middle lameel
the first layer of the plant cell wall to be formed when a plant cell divides made mainly of calcium pectate that binds the layes of cellouse together
which layer forms when the plant cell divids into 2 new cells
The middle lameela
What is pectin
a polysachharide that holds cell walls of neighbouring plant cells together and is part of the strucutre of the primary cell wall
what is the middle layer made of
Pectin
How is calcium pectate formed
pectin has lots of - charged carboxyl groups and these combine with + calcium ions to from calcium pectate
What is one property of the cellouse microfribilis
These walls are very flexible
What happens when the plant ages
secondary thickening may take place. A secondary cell wall builds up with the cellouse mircrofibrills laid densley at diffrent angles to each other.
What happens when the mircrofibrilis is laid densley at diffrent angles to each other
makes the composite material much more rigid
What are plant fibres
long cells with cellouse cell walls that have been heavily lignified so they are rigid and very strong
What is the primary cell wall
is the first very flexible plant cell wall to form with all the cellouse microfibrills oerinated in a simallr direction
What is the secondary cell wall
is the older plant cell wall in which the c
What is plasmodesmata
Are cytoplasmic bridges between plant cells that aloow communication between the cells
How does plasmodesmata form
as plant cells divide
What do the threads of cytoplasm do
the threads pass through the cytoplasm, The interconnected cytoplasm of the cells is known as the symplast
What is the symplast
interconnected cytoplasm of plant cells connected by the plasmdoesmata
