effect of glucose on cell membranes

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    • #2073
      benny
      Participant

      what effect does glucose have on the permeability of cell membranes?

    • #30396
      MrMistery
      Participant

      None that i know of..

    • #30432
      benny
      Participant

      that’s weird, because i’m doing a laboratory session on cell membranes and permeability and one of my pre lab questions is “what are the effects of glucose on cell membranes and pemeability?”

    • #30438
      paperclip
      Participant

      http://www.tensas.k12.la.us/pigpen/BIol … eaming.mov

      This is how glucose dhould move about in the cell

    • #30454
      Mjhavok
      Participant

      There are sugar parts in the membrane in the form of glycoproteins and glycolipids.

    • #30483
      baikuza
      Participant

      is the glucose not has any bond with the cell membrane?
      we need this information to answer yours.

    • #30511
      benny
      Participant

      For our experiment we have to cut up little cubes of beetroot and immerse them in 11 solutions, one of which is a mix consisting of 10% glucose and 1% formaldehyde. I guess the rest is water. This is all at room temperature of course. We then have to use a spectrophotometer to measure the absorption of each beetroot sample after 15 minutes, 30 minutes and 45 minutes. At the end of all this one of the questions we have to answer is “How does glucose affect cell permeability and why?”
      For that matter the next question is how does formaldehyde affect permeability and why?

    • #30550
      hurly
      Participant

      I suggest you read the theory for the lab experiment that you’re doing.

    • #30602
      MrMistery
      Participant

      Do the experiment and find out 😉

    • #30627
      Ellie
      Participant

      Hey, I am doing the same experiment, i suspect we may be in the same stream in biology, since it shows that your from adelaide.

      anyway this website may prove useful to you

      [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/D/Diffusion.htm]

      hope its useful for you 😕

    • #30638
      benny
      Participant

      are you at flinders ellie? wow, small world.

    • #30654
      Sparkles
      Participant

      I think the effect of glucose on permeability has something to with its cotransport with sodium that creates an electrochemical gradient.

    • #30667
      benny
      Participant

      thanks that’s very helpful. is there any where i could go to check this out in more detail?

    • #30684
      MrMistery
      Participant

      Glucose is transported inside the cell by a Na+ assisted simport system. So, yes the glucose might modify the electron gradient by inserting pozitive Na+ ions, but only if the cell “wants” to do so(remember simport is a form of active transport). So i don’t know if you can say glucose influences the permeability…

    • #30731
      benny
      Participant

      what is a simport system?

    • #30732
      benny
      Participant

      we haven’t come across that term yet.

    • #30734
      benny
      Participant

      simultaneous transport? transport of two molecules in the same direction?
      does glucose have an effect on the electron gradient? perhaps it’s presence induces influx of Na+ ions, an effect of cotransport.

    • #30738
      MrMistery
      Participant

      Wait wait wait wait…
      I apologise i think i am a total idiot. Glucose is transported inside the cell through a Na-dependend simporter(yes, you are right with the definition of simport) but it is a secondary active transport mechanism, so it only uses ATP as a Na gradient(in animal cell) or H+ gradient(in plant cell). If you already have the gradient(that does take ATP to create) glucose will enter the cell passively through a permease, taking Na+ or H+ with it. So you can say it influences.
      Take note that there is also a uniport way of transporting glucose passively, however this does not influence the permeability

    • #30765
      benny
      Participant

      so you think that the presence of glucose indirectly affects permeability, via it’s effect on the Na+ or H+ gradients?

    • #30769
      Mjhavok
      Participant

      I thought Glucose was transported through the cell membrane. It’s then changed into pyruvate and used in mitchondria for cellular respiration.

      I did an experiment in university measuring pigment leakage from beetroot and thus checking the effects on the membrane. This was using different temperatures and also concentrations of methanol and acetone.

    • #30787
      MrMistery
      Participant

      What you are saying is a completly different thing, Mjhavok


      @benny

      yes, that is what i am saying. But remember there is a pump that actively excrets Na+(at animal cell) or H+(at plant cell), so the balance will be quickly reestablished

    • #30995
      benny
      Participant

      so in a nutshell, glucose doesn’t have any effect in itself. it’s presence indirectly enacts other processes, ie the proteins responsible for ion transport. it doesn’t affect the cell membrane itself. or does it? these are only conclusions i’ve come to from these posts. i’m not sure if i’m right. does glucose as a sugar have any chemical effect on the hydrocarbons or the lipids within the membrane?

    • #31012
      MrMistery
      Participant

      I would say no

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