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    (Original post by JackoGeddes)
    what do you know about it? share the knowledge

    water moves in via osmosis
    adhesion between water and xylem walls, water pulled up
    cohesion like particles causes water to be pulled up as the water at the top is evaporated
    it's needed to provide water to area of photosynthis/photolysis

    am i close?
    Water enters the root hairs from the soil by osmosis. The water will then move across the cortex cells by moving through the spaces between cells. There is a continuous column of water in the xylem and root pressure will help move the water up the xylem. The force of attraction between water molecules, cohesion, will ensure the water columns will not break. The force of attraction between the xylem and the water molecules, adhesion, will adhere the water to the vessel walls. The transpiration pull will draw the water up the xylem. Water will evaporate into the air spaces of the leaf and diffuse out through stomata.

    Importance = The transpiration stream allows the uptake of minerals, it provides water for photosynthesis, gives support and has a cooling effect.

    I probably missed some stuff out because I don't have my sample essay questions with me but yeah.
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    I LOVE my Bio teacher.
    He told us the essay topics for the second prelim, and some other topics that are likely to come up in Section 2 of the paper.

    He didn't actually say what will come up, he just suggested But we all know what does that mean

    So apparently for the essay questions we're getting hormonal influence and E.Coli !
    I personally love the e.coli stuff so I'm over the moon right now!
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    (Original post by Nessie162)
    I LOVE my Bio teacher.
    He told us the essay topics for the second prelim, and some other topics that are likely to come up in Section 2 of the paper.

    He didn't actually say what will come up, he just suggested But we all know what does that mean

    So apparently for the essay questions we're getting hormonal influence and E.Coli !
    I personally love the e.coli stuff so I'm over the moon right now!
    Remember, what your teacher says isn't accurate. It's fair for him to make an educated guess at what it is, but don't bank on it coming up. If you dig out last years Higher Biology thread, you'll see the variety of essay predictions, which you can compare to the actual paper.
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    (Original post by Nessie162)
    I LOVE my Bio teacher.
    He told us the essay topics for the second prelim, and some other topics that are likely to come up in Section 2 of the paper.

    He didn't actually say what will come up, he just suggested But we all know what does that mean

    So apparently for the essay questions we're getting hormonal influence and E.Coli !
    I personally love the e.coli stuff so I'm over the moon right now!
    E. Coli? I don't remember any E. Coli when I did H. Bio. Why do yous get cool stuff after we leave?

    Since I've started browsing the Biology SH forum, I've discovered that A levelers do so much more human bio than we do. Mentioned it to my PBL group, apparently the guy who did the Bio board with lots of human knew 20% of last year already.
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    (Original post by TheFOMaster)
    Remember, what your teacher says isn't accurate. It's fair for him to make an educated guess at what it is, but don't bank on it coming up. If you dig out last years Higher Biology thread, you'll see the variety of essay predictions, which you can compare to the actual paper.
    Oh I meant our second prelim paper not the actual exam


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    (Original post by Hype en Ecosse)
    E. Coli? I don't remember any E. Coli when I did H. Bio. Why do yous get cool stuff after we leave?

    Since I've started browsing the Biology SH forum, I've discovered that A levelers do so much more human bio than we do. Mentioned it to my PBL group, apparently the guy who did the Bio board with lots of human knew 20% of last year already.
    I'm sure you must have when did you leave school ? I have a bio textbook published in 2008 and e.coli its quite a big chunk of the genetic control topic. Its a part of the Jacob-Monod hypothesis of gene action in bacteria


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    (Original post by Nessie162)
    I'm sure you must have when did you leave school ? I have a bio textbook published in 2008 and e.coli its quite a big chunk of the genetic control topic. Its a part of the Jacob-Monod hypothesis of gene action in bacteria


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    Nah, we just did straight up lac operon shiz. It was never put in context of an organism.
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    (Original post by Hype en Ecosse)
    Nah, we just did straight up lac operon shiz. It was never put in context of an organism.
    There is no real context. We are just told that the mechanism for turning genes on and off was first investigated using an E.Coli bacterium...
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    I like the lac operon! It looks confusing but it's actually really simple to understand.
 
 
 
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