Transport Accross Cell Membranes Flashcards
The cell membrane consists of…. and…
Proteins and phospholipids
A phospholipid and protein look like?
The phospholipid has a circular head with two legs
O=
A protein looks like a circular blob
O
How are passive and active transport different?
Passive does not need energy and moves from a high to a low concentration.
Active transport does need energy and moves the opposite direction
What is the definition of diffusion?
It is the movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient
What is the definition of osmosis?
Where water molecules move from a high water concentration to a low concentration down a concentration gradient through a selectively permeable membrane
What are the two differences between diffusion and osmosis?
Osmosis needs a selectively permeable membrane and is the movement of water
The two examples of passive transport are…..and…..
Osmosis and diffusion
An animal cell will…..if placed in a higher water concentration than inside a cell
Burst
What happens to an animal cell if it is placed into a solution with a lower water concentration than inside the cell?
Shrink
A plant cell will become….if placed in a higher water concentration than inside the cell
Turgid
What does plasmolysed mean?
It is when water leaves a plant cell. Low concentration outside of the cell, high inside
A….cell experiences turgid and plasmolysed states
Plant cell
…….transport requires energy to move against the gradient
Active
In the cell membrane, …….. membrane is required for active transport
Selectively permeable
