provide open passageways through the membrane for certain hydrophilic substances such as polar and charged molecules
allow the passage of ions accros the membrane
proteins that allow the passage of certain ions and small polar molecules through the membranes
bind to specific molecules, which are then transferred across the membrane after the carrier undergoes a change of shape
use energy (ATP) to transport materials across the membrane.
give each cell type a unique identification
attach to neighboring cells
provide binding sites for hormones or other trigger molecules
bounded by nuclear envelope, contains DNA
consist of RNA molecules and proteins
consist of stacks of flattened sacs involved in the production of various materials
modify and packages proteins and lipids
break down food (digest)
aerobic respiration, ATP
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