cell wall (see
next page for structure of primary and secondary cell wall & middle
2) hemicellulose - filler between cellulose microfibrils (chains of misc. sugar)
3) pectin - cementing agent or filler; high in middle lamella and fruit; (chains
of galacturonic acid)
c) protein - mainly structural (most commonly hydroxyproline)
composed of a bilayer of phospholipids and proteins; it is selectively permeable and
regulates absorption into cells and leakage from cells.
tubular plasma membrane extensions through cell walls that connect
4) cytoplasm - cytosol plus organelles; most metabolism occurs in the cytosol or its organelles.
b) organelles - specialized structures in cytoplasm, each with specific functions.
b) nucleolus - spherical, dense body; site of ribosome synthesis.
3) plastid - double membrane-bound bodies for storage and photosynthesis
2) elaioplast- fat and oil storage
c) chloroplast - green plastids that contains chlorophyll; the site of
cytoplasm; site of protein & membrane synthesis
5) ribosome - dense spheres of RNA; protein synthesis occurs on their surface
6) vacuole- storage of organic acids, salts, anthocyanins (blue, red and purple
pigments), metabolic wastes, enzymes and metabolites.
8) microbody- membrane-bound storage bodies with various functions.
9) microtubule - tubular rods used in mitosis & cellulose orientation in cell walls