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 |