Plant cell bio Flashcards
Function of cell wall
Tensile strength
How is the cell wall formed
Rosette shaped cellulose synthesizing complex
How does the rosette shaped complex work
Releases cellulose microfibrils outside plasma membrane
What happens to the cellulose microfibrils after they’re released
Polymerize + hydrogen bond to form cell wall
What does the cellulose microfibril deposition arrangement depend on
the arrangement of the microtubule
Microtubule function in plasma membrane
Determines pattern of cellulose microfibril formation
Cell wall components
Cellulose microfibrils, hemicellulose, pectin, lignin, soluble protein
Main component of secondary cell wall
Lignin
What happens to the cell when the secondary cell wall is added
It dies
Why does addition of lignin kill the cell
It prevents fusion of gas and water
Cell wall layers
Primary cell wall, middle lamella, secondary cell wall.
Which cell wall layer is closer to the plasma membrane
Secondary cell wall
Why is secondary cell wall closer to plasma membrane
Because they’re formed inside out
Which cell wall layer is the oldest
Primary/outermost
What replaces the extracellular matrix in plants
middle lamella
What is the middle lamella made of
Pectin
Function of pectin
Forms gel in matrix to “glue” stuff together, links with calcium ions to create jelly like pectin network structure filling middle lamella
What is cellulose made of
Beta glucose
When might the secondary cell wall be formed
After expansion ceases
What is the difference in composition and structure between primary and secondary cell wall
Cellulose microfibrils more parallel than in primary and higher proportion of cellulose in secondary
How do animal cells expand
Organelle synthesis
Plants expansion method
Water uptake
What direction does a plant cell expand in
Perpendicular to the cellulose microfibrils
