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| Questão | Responda |
| The cell membrane allows which tiny molecules to move freely through it. | Water, oxygen and carbon dioxide. |
| Starch is a ... and is ... to pass through. | Starch is a large molecule and is unable to pass through. |
| The cell membrane is said to be... | ...selectively permeable. |
| Diffusion is a ..., it ... require energy. | Diffusion is a passive process, it does not require energy. |
| What is the definition of diffusion? | Diffusion is the movement of molecules from a region of high concentration to low concentration. in living cells this would take place across a selectively permeable membrane until the concentrations are equal. |
| In diffusion, molecules always move along a concentration gradient from ... to ... concentration. | In diffusion, molecules always move along a concentration gradient from high to low concentration. |
| Diffusion is the means by which useful substances such as ..., enter a cell and waste materials such as ..., leave a cell. | Diffusion is the means by which useful substances such as oxygen, enter a cell and waste materials such as carbon dioxide, leave a cell. |
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