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2C Elevate Science
Topic 2 The Cell Systems Lesson 3 Obtaining and Removing Materials
| Question | Answer |
|---|---|
| What does the cell membrane help to meaintain in a cell? | homeostasis |
| What is the cell membrane made up of? | made up of carbohydrates, proteins and lipids |
| The cell membrane is selectively permeable- What does this mean? | it allows some things to freely pass, and some things to not pass at all (or less freely) |
| What is active transport? | it is the movement of materials across a cell membrane with the use of energy |
| How do molecules move in active transport? | molecules move from an area of lower concentration to an area of higher concentration |
| What do transport proteins do during active transport? | they pick up specific molecules and carry them across the membrane |
| What is endocytosis? | particles move into (enters) the cell |
| What is exocytosis? | particles move out (exit) the cell |
| Why are endocytosis and exocytosis both parts of active transport? | they both require energy |
| What is passive transport? | it is the movement across a cell membrane without the use of energy |
| What is diffusion? | molecules move from an area of higher concentration to an area of lower concentration |
| How is the scent of a candle an example of diffusion? | when lit, it diffuses around the room, filling theroom with the scent |
| What is osmosis? | it is the diffusion of water across a selectively permeable membrane |
| What is facilitated diffusion? | proteins provide a pathway for some molecules (sugar) to move through the cell |
Created by:
carlsond
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