TRANSPORTATION etc

Visualization of the general features of a cell

Visualization of fine structure of a cell

(TEM) stands for?

(SEM) stands for?

(AFM) stands for?

(~75%): contains a polar (charged, hydrophilic) head and a nonpolar (uncharged, hydrophobic) tail; readily forms the lipid bilayer

(~25%): present in much smaller amounts in the lipid bilayer compared to phospholipids; contributes to the fluid nature of the membrane

describes the plasma membrane as being neither rigid nor static in structure, but instead has a highly flexible structure and can change its shape and composition through time

• These are protein molecules that are attached to, or associated with, the cell membrane or with an organelle

• Based on location: integral or peripheral

Function as binding sites for chemical signals in the extracellular fluid Binding of chemical signals to receptors triggers cellular responses