1.2 PLANT CELL ARCHITECTURE Flashcards
Cell Wall, Cell Membrane
principle scaffolding component of a cell wall
cellulose
reason for different patterns in layers of cell wall
depolymerization and repolymerization
type of cell wall- relatively thicker, stronger
-has lignin for strength, support, and protection
-required for terrestrial colonization and vertical growth
secondary cell wall
type of cell wall- characteristic in young/growing plants
offers physical support
primary cell wall
different compounds that compose a cell wall…
carbohydrates, structural proteins, aromatic, polymeric lipids
holds together cell wall of neighboring plant
middle lamella
process of separating middle lamella
maceration
types of carbohydrates in cell wall
cellulose, hemicellulose, pectins
carbohydrate:
cross-linking glycans
can coat microfibrils together with their Hydrogen bonds to the microfibrils
hemicellulose
carbohydrate:
-determines wall porosity
-provides charged surfaces that modulate pH/ ion balance
-regulate cell to cell adhesion at the middle lamella
- contains recognition molecules to alert
pectins
types of structural proteins in cell wall…
hydroxyproline, proline, glycine, arabinogalactan proteins
type of aromatic compounds in cell wall
hydroxycinnamates
polymeric lipids in cell wall
waxes, cutins, suberins
functions of a cell membrane in a eukaryotic cell:
-envelope genetic material
-delimit boundaries of other internal structures
-regulate fluxes of ions and metabolites
membrane protein- embedded in bilayer
integral protein