Biology 2.1.5 Simple/facilitated diffusion and active transport

Question	Answer
Define diffusion	The net movement of molecules (or ions) from a reigon of higher concentration to a reigon of lower concentration
What is simple diffusion?	Movement through the phospholipid bilayer
What molecules can pass through the phospholipid bilayer through simple diffusion?	Small or lipid soluble (non-polar molecules)
Are lipid soluble molecules polar or non-polar?	Non-polar
Are water soluble molecules polar or non-polar?	Polar
What is facilitated diffusion?	Movement of ions or molecules through a channel/carrier proteins
What can pass through channel proteins?	Specific ions such as sodium, calcium Image: Channel Protein (binary/octet-stream)
,What can pass through a carrier protein?	Specific, large, polar molecules such as glucose or amino acids Image: Carrier (binary/octet-stream)
How do carrier proteins work?	A specific molecule binds to the protein, it changes shape and allows it to cross the membrane Image: Carrier (binary/octet-stream)
Define active transport	Movement of molecules against the concentraion gradient, from low to high concentration
How do the molecules pass through the membrane during active transport?	Carrier proteins
What three factors effect active transport?	Temperature Oxygen (used for ATP) Poisen (stops respiration)

Resource summary

	Created by Sam Gunnell over 5 years ago