Unit 9.2 Flashcards
What is simple diffusion?
This is when molecules move directly over the lipid bilayer. Only small nonpolar molecules can use this. This doesn’t use energy and goes with the concentration gradient.
What is facilitated diffusion?
This is when molecules move across the membrane using protein channels. Small charged molecules can do this. This doesn’t use energy and goes with the concentration gradient.
What is Hypertonic osmosis?
This is when there is more solute then water
What is hypotonic osmosis?
This is when there is more water then solute.
What is isotonic osmosis?
This is when the amount of solute and water is equal
What is active transport?
This is when molecules move against the concentration gradient using ATP.
What is endocytosis?
When molecules come using a vesicle to the cell membrane wall and attact then open a hole and are released.
What is exocytosis?
This is when the cell membrane surrounds the molecules on the outside and then sucks them in and then pops off a vesicle to the inside.
What are the properties and structrues of phospholipids?
They have a hydrophillic head and a hydrophobic tail. They make up the lipid bilayer and let small nonpolar molecules go through.
What is the importance of surface area to volume ratio?
If you have a large surface area but small volume that will diffuse the fastest since it has the most places to attract with a shorter space to cover.
