Cell Membrane Best Study Guide
1. Active transport: Energy-requiring movement of molecules
across a mem- brane from a region of lower concentration to a
region of higher concentration.
2. Cell membrane: Forms a boundary between a cell and the
surrounding envi- ronment and controls the passage of materials
into and out of the cell.
3. Concentration gradient: Difference in the concentration of a
substance from one location to another.
4. Diffusion: Movement of dissolved molecules in a fluid or gas
from a region of higher concentration to a region of lower
concentration.
5. Endocytosis: Uptake of liquids or large molecules into a cell by
inward folding of the cell membrane.
6. Exocytosis: Release of substances out of a cell by the fusion
of a vesicle with the membrane.
7. Facilitated diffusion: Diffusion of molecules assisted by
protein channels that pierce a cell membrane.
1. Active transport: Energy-requiring movement of molecules
across a mem- brane from a region of lower concentration to a
region of higher concentration.
2. Cell membrane: Forms a boundary between a cell and the
surrounding envi- ronment and controls the passage of materials
into and out of the cell.
3. Concentration gradient: Difference in the concentration of a
substance from one location to another.
4. Diffusion: Movement of dissolved molecules in a fluid or gas
from a region of higher concentration to a region of lower
concentration.
5. Endocytosis: Uptake of liquids or large molecules into a cell by
inward folding of the cell membrane.
6. Exocytosis: Release of substances out of a cell by the fusion
of a vesicle with the membrane.
7. Facilitated diffusion: Diffusion of molecules assisted by
protein channels that pierce a cell membrane.
