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    Hi guys, I'm at uni, first year Biomed. Can someone please help me with this stuff on spores in bacteria? I'd really appreciate it.
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    Does anyone have the Examiner Report of the coursework of Edexcel last year?
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    hi guys - doing some revision and I don't trust this website im using. Is it true that pioneer plants don't change the environment / facilitate??
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    Method of measuring curvature of a radicle??
    Please help me!!!
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    (Original post by VetWannabeee)
    hi guys - doing some revision and I don't trust this website im using. Is it true that pioneer plants don't change the environment / facilitate??
    Pioneer plants change some of the abiotic factors, eg, how rich the soil is (nutrients)
    And yes, they do facilitate. I wouldn't trust the website youre using if I were you.
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    (Original post by MyselfEtAl)
    Pioneer plants change some of the abiotic factors, eg, how rich the soil is (nutrients)
    And yes, they do facilitate. I wouldn't trust the website youre using if I were you.
    But I don't think they change the immdediate enviroment so I mean like bushes providing habitats and food chains ect .. it changes it to start the process of succession
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    could someone please define the terms for me;

    target tissue
    respiratory substrate

    thanks
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    (Original post by volvicstar)
    could someone please define the terms for me;

    target tissue
    respiratory substrate

    thanks
    The target tissue is the group of cells that a compound, e.g. a hormone is supposed to work at. For example, the target tissue for adrenaline is a heart tissue.

    A respiratory substrate is a compound that will bind to an enzyme, in order to facilitate respiration (aerobic or anaerobic), such as glucose.
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    (Original post by thegodofgod)
    The target tissue is the group of cells that a compound, e.g. a hormone is supposed to work at. For example, the target tissue for adrenaline is a heart tissue.

    A respiratory substrate is a compound that will bind to an enzyme, in order to facilitate respiration (aerobic or anaerobic), such as glucose.
    thanks
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    Is this book recommended for A Level Biology?
    http://www.amazon.co.uk/gp/product/0...A3KK0S74UJZEWZ
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    (Original post by Id and Ego seek)
    Is this book recommended for A Level Biology?
    http://www.amazon.co.uk/gp/product/0...A3KK0S74UJZEWZ
    No, it depends on the school and exam board
    a good one for OCR is OCR biology heinmann

    or advanced biology micheal kent for all exam boards AS and A2
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    (Original post by Id and Ego seek)
    Is this book recommended for A Level Biology?
    http://www.amazon.co.uk/gp/product/0...A3KK0S74UJZEWZ
    Advanced Biology by Jones and Jones is excellent!

    Didn't realise it was that expensive though!
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    can someone help me with my thread, so far i have 149 views but no reply ):
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    (Original post by thegodofgod)
    Advanced Biology by Jones and Jones is excellent!

    Didn't realise it was that expensive though!
    Cheers mate!

    Haha, the price is fine. It'll be worth it at the end :teehee:
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    (Original post by aceySnicks_x)
    can someone help me with my thread, so far i have 149 views but no reply ):
    Which thread? :erm:
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    Hello!
    I would love to join our society. I'm interesting and fascinating about biology and other natural sciences! So Introduce myself!

    Name: Gregorius alias Kallisto
    Hobbies: reading, art, martial art, sport (mainly martial art ), natural science (physics, biology and chemistry of course)
    Where you live: Anywhere in Germany
    Current Studying level: Studying for my life and an A-level at the moment!
    What you are studying: natural sciences (physics, biology and chemistry), languages (German, English and Latin) and social sciences (history and politic/economy) - these are my subjects.
    Hero(s): Gregor Mendel is one of my hero in biology: he has discovered the mendelian inheritance which were an important step in genetics in my opinion!
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    I'm wonder why there is no a member who is writing in this topic. Okay, it's my turn again!
    I'm reading doctrines about molecular genetics. I want to know what happen by a glycosidic bond. Why is it so important for DNA? Please answer in a short comment, if it's possible.
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    (Original post by Kallisto)
    I'm wonder why there is no a member who is writing in this topic. Okay, it's my turn again!
    I'm reading doctrines about molecular genetics. I want to know what happen by a glycosidic bond. Why is it so important for DNA? Please answer in a short comment, if it's possible.
    Hi, a glycosidic bond is formed by a condensation reaction (one water molecule is lost), just like when two glucose molecules condense to form one molecule of maltose.

    The opposite of a condensation reaction is a hydrolysis reaction, which is where one molecule of water is added to a compound, which splits it into two, e.g. maltose + water --> 2 glucose.

    One nucleotide (the repeating unit of any nucleic acid, e.g. DNA, RNA) is joined up to another via a glycosidic bond. Also, each part of a nucleotide (the pentose sugar, the organic base, and the phosphate group) is linked by a glycosidic bond.
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    (Original post by thegodofgod)
    Hi, a glycosidic bond is formed by a condensation reaction (one water molecule is lost), just like when two glucose molecules condense to form one molecule of maltose. (...)
    Hmmm... that sounds after an esterification as in a reaction between deoxyribose and phosphoric acid in this case. One water molecule is lost as well by this reacton. That's why I think a glycosic bond is also an esterification. That makes sense, because a condensation reaction IS an one. Am I right?
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    (Original post by Kallisto)
    Hmmm... that sounds after an esterification as in a reaction between deoxyribose and phosphoric acid in this case. One water molecule is lost as well by this reacton. That's why I think a glycosic bond is also an esterification. That makes sense, because a condensation reaction IS an one. Am I right?
    Esterification is different as it has the following group:

    O
    ||
    C-O-R
    |
    R

    , whereas a glycosidic bond has the following group:

    ....R.....R
    ....|......|
    R-C-O-C-R
    ....|......|
    ....R.....R

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Updated: April 6, 2014
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