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    (Original post by tewas)
    Plants that live in the Arctic have a relatively short growing season in which the light intensity is always relatively low. Many species growing in these conditions have a high level of anthocyanin pigments in their leaves. The combined effect of these red pigments with the green chlorophyll makes the leaves appear dark purple or black.
    Suggest why this adaptation is useful in increasing photosynthetic rates.

    How do you answer this?
    Black is a good absorber of light/heat energy, so having dark leaves maximises volume of light energy absorbed by plant during it's short growing season.

    Seems more like a Physics answer though...
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    (Original post by corey7695)
    where does glycolysis occur?
    In the cytoplasm

    state the exact location where steroid hormones are made in he body
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    (Original post by Beni24)
    Guys which paper do you think was the hardest? So I can have a go at doing it
    BBoth of the 2011 papers. The synoptic questions really catch you out
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    Specification 4.3.1 m) state that TP can be used to make carbohydrates, lipids and amino acids.
    Textbook pg. 64 says its GP...

    can someone help?
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    (Original post by TheLegalDealer)
    In the cytoplasm

    state the exact location where steroid hormones are made in he body
    the cortex of the adrenal gland

    define homeostasis [3]
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    (Original post by TheLegalDealer)
    In the cytoplasm

    state the exact location where steroid hormones are made in he body
    is it the adrenal cortex?
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    (Original post by corey7695)
    the cortex of the adrenal gland

    define homeostasis [3]
    The constant maintenance of the bodys internal environment within strict limits even thought it is constantly changing ?

    outline what happens to pyruvate in yeast in anaerobic conditions
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    (Original post by s.c.a1)
    does anyone know what they mean by polygenic genes in the continuous and discontinous variation spread to me it sounded a bit like epistasis or codominance but it said that those are only for discontinuous variation.so confused
    Polygenic - caused by BOTH environment and genes, i.e. continuous variation.

    Monogenic - caused by genes ONLY, i.e. discontinuous variation.

    For example...
    Height = continuous variation. Influenced by your genes (how tall your parents are) but also influenced by environment (type of food you eat, how much exercise you do etc)

    Eye colour = discontinuous variation. Influenced by genes only. Eye colour is never changed by environmental variations ... (unless you can get some plastic surgery to change your eye colour? )

    EDIT: Ignore me, polygenic = characteristic coded for by many genes, monogenic = characteristic coded for by one gene
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    Past question that I don't understand to do with respiration...

    "The equation below shows aerobic respiration of compound A.
    C55H100O6 + 77O2 → 55CO2 + 50H2Ocompound A
    The respiratory quotient (RQ) is defined as: volume of CO2 releasedvolume of O2 absorbed|
    (ii) Calculate the RQ for this reaction. Show your working."

    I got 0.71 which was correct. But the next question was...
    "Compound A is a fat. Suggest what the RQ of a carbohydrate such as glucose might be" The answer is 1.0 but I have no idea why! Anyone know why it's 1.0?? thanks
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    (Original post by tewas)
    is it the adrenal cortex?
    Yes , btw you have to say Adrenal as it asks for the specific location
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    (Original post by corey7695)
    the cortex of the adrenal gland

    define homeostasis [3]
    The maintenance of internal conditions at a constant state despite changes in the external environment
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    (Original post by joycestick)
    Specification 4.3.1 m) state that TP can be used to make carbohydrates, lipids and amino acids.
    Textbook pg. 64 says its GP...

    can someone help?
    My revision guide says its TP and if that's what the spec says as well i'd go with that
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    (Original post by TheLegalDealer)
    In the cytoplasm

    state the exact location where steroid hormones are made in he body
    The adrenal medulla?? not sure about that
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    What does a low and a high Respiratory substrate indicate?
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    (Original post by TheLegalDealer)
    The constant maintenance of the bodys internal environment within strict limits even thought it is constantly changing ?

    outline what happens to pyruvate in yeast in anaerobic conditions
    perfect

    it is decarboxylated to form ethanal, which is hydrogenated by red nad to form nad, and ethanol is formed (my book doesn't reference the enzymes, is it lactate dehydrogenase and decarboxylase?)

    explain the process that occurs when the body is dehydrated
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    (Original post by gh1290)
    The adrenal medulla?? not sure about that
    All steroid hormones are made in the adrenal cortex and adrenaline is made in the adrenal medulla
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    (Original post by corey7695)
    the cortex of the adrenal gland

    define homeostasis [3]
    Would you need to give the definition AND an example to get the three marks?
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    (Original post by brooklyniona)
    Past question that I don't understand to do with respiration...

    "The equation below shows aerobic respiration of compound A.
    C55H100O6 + 77O2 → 55CO2 + 50H2Ocompound A
    The respiratory quotient (RQ) is defined as: volume of CO2 releasedvolume of O2 absorbed|
    (ii) Calculate the RQ for this reaction. Show your working."

    I got 0.71 which was correct. But the next question was...
    "Compound A is a fat. Suggest what the RQ of a carbohydrate such as glucose might be" The answer is 1.0 but I have no idea why! Anyone know why it's 1.0?? thanks
    i think it's something that you need to know eg. carbohydrate = 1.0, fats = 0.7 and proteins = 0/9
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    (Original post by joycestick)
    Specification 4.3.1 m) state that TP can be used to make carbohydrates, lipids and amino acids.
    Textbook pg. 64 says its GP...

    can someone help?
    I think mark schemes are pretty lenient on this one, from what I've seen anyway.

    GP can be used to make fatty acids and amino acids.

    TP can be used to make various hexose sugars (e.g. glucose) and glycerol.

    Both GP and TP would be needed to make lipids ( fatty acids from GP, glycerol from TP).
    TP is needed for the carbohydrates (the hexose sugars).
    GP is needed for the amino acids.

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    (Original post by thequackingduck)
    Would you need to give the definition AND an example to get the three marks?
    the definition is quite long, and i think its a mark for each part of the definition
 
 
 
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