Biology 2.1.5 Simple/facilitated diffusion and active transport

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A level Biology (2.1.5 Biological membranes) Flashcards on Biology 2.1.5 Simple/facilitated diffusion and active transport, created by Sam Gunnell on 07/03/2019.
Sam Gunnell
Flashcards by Sam Gunnell, updated more than 1 year ago
Sam Gunnell
Created by Sam Gunnell over 5 years ago
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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
,What can pass through a carrier protein? Specific, large, polar molecules such as glucose or amino acids
How do carrier proteins work? A specific molecule binds to the protein, it changes shape and allows it to cross the membrane
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)
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