Movement of Substances Into and Out Of Cells Flashcards
1
Q
Diffusion
A
The net movement of molecules from an area of high concentration to an area of low concentration
2
Q
Active transport
A
The movement of molecules against the concentration gradient using energy from respiration
3
Q
Osmosis
A
The net movement of water molecules from an area of high water potential to an area of low water potential
4
Q
Greater concentration gradient
A
Diffusion happens more quickly
5
Q
Larger surface area in proportion to volume
A
Increase the rate of diffusion
6
Q
Greater distance over which diffusion has to take place
A
The rate of diffusion is decreased
7
Q
Higher temperatures
A
The rate of diffusion increases because the particles have more kinetic energy
8
Q
Describe an experiment to measure the effect of a factor upon rate of diffusion
A
- Cut a cube of Agar jelly dyed with potassium permanganate from a petri dish
- Drop the cube into a beaker of dilute hydrochloride acid
- Note the time taken for the cube to turn colourless
- Repeat and average
- Change the independent variable and repeat
