Diffusion 0.0 / 5 ? BiologyCellular processesASAQA Created by: meganbradfield1Created on: 23-03-16 18:08 What kind of transport is diffusion? Passive 1 of 11 What is the definition of diffusion? Net movement of molecules/ions from a region where they are highly concentrated to a lower concentration. 2 of 11 How does concentration gradient affect the rate of diffusion? The greater the difference in concentration of molecules on either side of the exchange surface, the faster the rate. 3 of 11 How does area affect diffusion? Larger the area, faster the rate. 4 of 11 How does the thickness of exchange surface affect diffusion? Thinner the surface, faster the rate. 5 of 11 What is diffusion proportional to? Surface area x Difference in concentration divided by length of diffusion path 6 of 11 What does facilitated diffusion rely on? The kinetic energy of diffusing molecules. 7 of 11 Where on a plasma membrane does facilitated diffusion occur? Where protein molecules are found. 8 of 11 In facilitated diffusion, what do proteins on the plasma membrane form and what does this allow? Protein channels across the membrane; allows water-soluble ions to pass through. 9 of 11 What does another form of facilitated diffusion involve? Carrier proteins that span the plasma membrane. 10 of 11 How is a molecule released inside the membrane via carrier proteins? The molecule will be specific to the carrier and bind to it, changing its shape and then being released into the membrane. 11 of 11
WHY MULTICELLULAR ORGANISMS NEED SPECIALISED EXCHANGE SURFACES AND SINGLE CELLED ORGANISMS DO NOT 4.5 / 5 based on 3 ratings
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