bio: how is the permeability of cell membranes affected by heat??? Watch

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Saf!
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for bio c/wk we have to find out how the permeability of beetroot cell membranes is affected by heat....................... i think it'll become more "leaky".......but why???
someody pleeeease help!!.....i'm soooo stuck!!
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MadNatSci
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Yes, it will become more leaky. As the temperature rises the kinetic energy of the lipids in the cell membrane also rises and the whole thing becomes more fluid, so more compounds can get through (you're likely to get more transient pores - holes that appear very briefly in the membrane - that substances can nip through).

Conversely, as the temperature drops the lipid bilayer 'freezes' - it becomes more solid and so less can pass through. You have compounds like cholesterol in your membranes to help your membranes stay viable at lower temperatures
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NDGAARONDI
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When you say heat, do you mean temperature?
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Saf!
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(Original post by NDGAARONDI)
When you say heat, do you mean temperature?
yep
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Saf!
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(Original post by MadNatSci)
Yes, it will become more leaky. As the temperature rises the kinetic energy of the lipids in the cell membrane also rises and the whole thing becomes more fluid, so more compounds can get through (you're likely to get more transient pores - holes that appear very briefly in the membrane - that substances can nip through).

Conversely, as the temperature drops the lipid bilayer 'freezes' - it becomes more solid and so less can pass through. You have compounds like cholesterol in your membranes to help your membranes stay viable at lower temperatures
thanx! ......also, the channel proteins denature, so does that affect it at all??
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Fluffy
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(Original post by Saf!)
thanx! ......also, the channel proteins denature, so does that affect it at all??
Yup - was just about to post that
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