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science test
cell
| Question | Answer |
|---|---|
| passive transport | is the movement of substances through a cell membrane without using the cells energy. |
| active transport | the movement of substances through a cell membrane using the cells energy. |
| diffusion | the movement of substances from an area of HIGHER concentration to LOWER concentration |
| osmosis | the diffusion of water molecules ONLY |
| facilitated diffusion | when molecule pass through a cell membrane using special proteins. |
| Endocytosis | when a cell takes in a substance by surrounding it with the cell membrane. |
| Exocytosis | when a cells vesicles release their contents outside the cell |
| Define Exocytosis | when a cells vesicles release their contents outside the cell |
| Define Endocytosis | when a cell takes in a substance by surrounding it with the cell membrane. |
| What sized molecules pass through a membrane | small molecules |
| Describe a semipermeable membrane | a barrier that allows certain molecules and ions to pass through it |
| what is the advantage of passive transport? | it allows molecules to move across a cell membrane without using the cells energy, saving ATP for other processes. |
| how do materials move thru a cell membrane in facilitated diffusion? | It uses transport proteins called channel and carrier proteins and channel proteins form pores and carrier proteins carry large molecules |
| movement of molecules | active transport- LOWER to HIGHER concentration. passive transport- HIGHER to LOWER concentration |
Created by:
SofiaContac