level: B1.2
Questions and Answers List
cell biology
level questions: B1.2
| Question | Answer |
|---|---|
| What is diffusion? | substances move a higher concentration of that substance to where there is a lower concentration of that substance |
| Why does diffusion happen? | random movement of particles in a fluid |
| how can the rate of diffusion be changed? | difference in concentrations, temperature, surface area of the membrane |
| How does water move across a cell membrane? | osmosis |
| What is osmosis? | diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane |
| partially permeable | small molecules can move through but large molecules cannot |
| what is active transport | moving substances against the concentration gradient so requires energy. |
| where does energy come from in active transport? | respiration |
| What do cells that carry out lots of active transport have a lot of? | mitochondria |