AP Bio: Ch. 5 Cell Membranes

____ can readily diffuse across a lipid bilayer.

Carbon dioxide and Oxygen

Cell Membranes consist mainly of a

lipid bilayer and proteins

Immerse a living cell in a hypotonic solution, and water will tend to ___.

move into the cell

Vesicles form by way of ___.

phagocytosis

Most membrane functions are carried out by

proteins

Some sodium ions cross a cell membrane through transport proteins that first must be activated by an energy boost. This is an example of ___.

Active transport

Diffusion is the movement of ions or molecules from one region to another where they are less concentrated. The rate of diffusion is affected by ___.

Temperature, Electrical gradients, Molecular size

Plasma emmbranes incorporate ___.

Transport proteins, Adhesion proteins, Recognition proteins

describe each term a) phagocytosis b) passive transport c) recognition protein d) active transport e) phospholipid f) concentration gradient g) receptors

a) one cell engulfs another b) no energy boost required to move solutes c) molecular fingerprint d) requires energy boost e) big in membranes f) basis of diffusion g) docks for signals and substances at cell surface

In a lipid bilayer, ___ of all of the lipid molecules are sandwiched between all of the ___.

hydrophobic tails; hydrophilic heads