The cell surface membrane - surface area and substance exchange 3.0 / 5 based on 2 ratings ? BiologyCellular processes and structureASWJEC Created by: sophiee96Created on: 10-11-12 19:17 Name a unicellular organism? Amoeba 1 of 10 Characteristic of a unicellular organism? High surface area to volume ratio 2 of 10 Do organisms with high surface area to volume ratio need lungs or gills? No 3 of 10 What sort of things pass into the organism? Nutriants and oxygen 4 of 10 What limits the size to which the unicellular organism can grow? How rapidly nutrients and oxygen is used up 5 of 10 What would happen if vital chemicals didnt reach all parts of the cell? Death would occur 6 of 10 How does a unicellular organism satisfy its needs? Through direct diffusion 7 of 10 Does a larger organism have a lower or higher surface area to volume ratio? Lower 8 of 10 Why are the surfaces exposed for exchange of substances reduced in larger Organisms? Because cells join to adjacent ones 9 of 10 Why do many multicellular organisms have specially adapted exchange structures? Because there is a reduced surface areas 10 of 10
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