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biology-ks cell part

biology-keystone u1

QuestionAnswer
cell membrane (plasma membrane) -boundary between intracellular and extracellular environments -regulates entry/exit of substances -flexible and allows the cell to vary its shape if necessary -helps maintain a chemical balance within the cell
cell wall -rigid structure providing support for cell -thicker than the cell membrane -inflexible -protects the cell and gives the cell its shape
cytoplasm -jelly-like substance filling intracellular space -contains dissolved substances
cyto-skeleton -network of fine tubes and threads -provides internal structural support
centrioles -paired rods -help organize microtubules during mitosis
nucleus membrane-bound structure containing cells' genetic information and support molecules
nucleolus -small structure within nucleus -site of production of ribosomal RNA
nuclear membrane -boundary between nucleus and cytoplasm -regulates passage of materials between the two
flagella, pili, cilia -structures used to enable movement of cells or sometimes to propel substances across outer surface of cell -predominantly protein in composition
mitochondria -membrane bound organelle -folded membranes contain enzymes for aerobic respiration -little DNA
chloroplasts -membrane bound organelle -folded membranes contain chlorophyll and enzymes for photosynthesis -little DNA
vacuole -membrane bound area filled with water and assorted solutes -role in maintenance of water balance of the cell
ribosomes -small organelles at which protein synthesis occurs -may be free floating or membrane bound
smooth ER -network of flattened membranes forming tunnels -enzymes assisting synthesis of some lipids -final processing of proteins
rough ER -ribosomes embedded in membrane -proteins to be exported from cell produced here
Golgi body -stacks of saucer shaped membranes where export proteins are modified and stored prior to entering secretory vesicles for exocytosis
lysosomes -membrane bound structure -contains enzymes, which break down toxic or unwanted molecules
plastids membrane bound structures with varied functions -leucoplasts=starch storage -chromo lasts=colored pigments within
vesicles -packages for storage -temporary transport associated with endocytosis/exocytosis
Created by: amandathornton