Marvellous Membranes Flashcards
What does diffusion allow
A process that allows substances to enter and exit cells
What are two components of the cell membrane
Lipids and proteins
What is diffusion
The movement of a substance from an area of high concentration to a area of low concentration
What is osmosis
A special type of diffusion. The movement of water from an area of high concentration to an area of low concentration (down a concentration gradient) through a selectively permeable cell membrane
What is the term used to describe a plant cell if it has lost water due to osmosis
Plasmolysid
What is the term used to describe a plant cell which has gained water due to osmosis
Turgid
What is the term used to describe a animal cell which has burst due to water gain from osmosis
Lysis
What is the term used to describe a animal cell if it has lost water due to osmosis
Crenated
Give examples of passive transport
Diffusion and osmosis
What is passive transport
Passive transport is the movement of a substance down a concentration gradient and does not require energy
What is active transport
Active transport is the movement of a substance up ( against) a concentration gradient and does require energy
What part of the membrane is involved with the movement of molecules by active transport
Proteins
What do phospholipids do
Form a bilayer e
Why is the cell membrane described as selectively permeable
Because it allows some molecules to pass through it, but not others
What is respiration
A series of enzyme controlled reactions during which glucose is borked down to release energy
