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chelley2
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#2841
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#2841
can somebody help!
"Why is it useful to calculate the index of diversity than record the number of species" -_-


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anonymousecheese
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#2842
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#2842
HEPATIC VEIN-away from liver
HEPATIC ARTERY- to liver

HEPATIC PORTAL VEIN- away from gut to liver

RENAL VEIN-away from kidney
RENAL ARTERY-to kidney
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Suzanna5678
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#2843
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#2843
Is it too early to go to bed
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annaelizabet
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#2844
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#2844
Would someone be happy to go over the ways in water transports in a plant? Like root pressure, etc. I HATE PLANTS
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anonymousecheese
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#2845
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#2845
Yaaaaaaaaaaaaaaaaaaay!!!!
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thechem1
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#2846
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#2846
(Original post by PrimusInterPares)
can someone explain how mutation in base sequence changes a protein to make it non functional???
thank you
-Mutation in DNA causes the amino acid sequence to be different

-Different amino acid sequence gives different tertiary shape of protein

-Different tertiary shape means different shaped active-site

-So substrate cannot bind and cannot form ES-complexes therefore the enzyme becomes non functional
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BioChemSocio
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#2847
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#2847
(Original post by chelley2)
can somebody help!
"Why is it useful to calculate the index of diversity than record the number of species" -_-


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To know the number of different species and number of individuals within a species as some species occur in small numbers
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denteddental
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#2848
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#2848
(Original post by chelley2)
can somebody help!
"Why is it useful to calculate the index of diversity than record the number of species" -_-


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It shows the number of individuals in a species?
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SophieL1996
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#2849
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#2849
are there any past q's on fish apart from 09 jan?
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ajv1000
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#2850
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#2850
(Original post by chelley2)
can somebody help!
"Why is it useful to calculate the index of diversity than record the number of species" -_-


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shows no of individuals and no. of species
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Manni
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#2851
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#2851
(Original post by Nav_Mallhi)
HAHA! I love my languages, can speak 5 in total.

It was much much harder than any of the past papers, hopefully the grade boundaries should be low.

Mechanics or Stats?
Wow check you out! That's quite impressive

yeah I really do hope so!

stats wby
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anonymousecheese
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#2852
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#2852
(Original post by annaelizabet)
Anyone need help??????
YES PLEASE Q 4C on may 12
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KaranbirBandesha
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#2853
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#2853
(Original post by chelley2)
can somebody help!
"Why is it useful to calculate the index of diversity than record the number of species" -_-


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Index diversity takes into account each individual in each species and some species may have a small number of individuals
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Sorro10
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#2854
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#2854
(Original post by annaelizabet)
Would someone be happy to go over the ways in water transports in a plant? Like root pressure, etc. I HATE PLANTS

Basically water wants to get from the soil into the xylem vessels. It can do this by 2 methods or 'pathways' called the SYMPLAST PATHWAY or APOPLAST PATHWAY. (Might be useful if you get a labelled diagram showing xylem/root hair cell etc whilst reading this).

Symplast Pathway

In the Symplast pathway, water moves through the CYTOPLASMS of the cells.
Water diffuses along a water potential gradient through PORES between the cells of the Cortex called plasmodesmata. The Cortex is simply all the cells between the Root hair cell and the Xylem vessel.

Apoplast Pathway

In the Apoplast pathway, water moves through the CELL WALLS of the cells.
Water stops at the ENDODERMIS as there is a CASPARIAN STRIP which prevents the water from passing further, making the water pass through a membrane by osmosis down a water potential gradient INTO THE SYMPLAST PATHWAY, which is useful as it prevents harmful substances such as toxins or viruses from entering the xylem vessels as the membrane would not let them past.

--------------------------------------------------------------------

EXTRA

- Water potential in the root hair cell is lowered by the active transport of mineral ions from the soil, hence water can move from the soil into them down a water potential gradient.

Watch this, if you need more help:

http://www.youtube.com/watch?v=TWNtXw-MWtE
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thechem1
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#2855
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#2855
Anyone got a potential 6 marker on gas exchange in fish?

And a sample answer.
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annaelizabet
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#2856
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#2856
(Original post by anonymousecheese)
YES PLEASE Q 4C on may 12

is there anyway you could tell me it? I can't seem to find that paper
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Paulineuh
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#2857
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#2857
Is it possible to get full UMS without getting full marks?

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_iiGEO
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#2858
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#2858
(Original post by marseille_h)
I converted the cm and the um into meter, (x10^-2cm) and (x10-6um) but when i measure from X to Y I get 2.2cm, am i measuring it wrong or my ruler is trolling me .

(4.9 x 10^-2) / ( 20 x 10^-6) = x2450

so my units are right but my measurment of the image is not right..

i just measured it again you can get either 4.8 4.9 or 5.0cm i dont know how your getting 2.2cm, oh wait.. is the past paper printed out in the normal size or have you shrunk it down to smaller size? maybe that explains why the size of your image is small when you measure it.. let me know but yeah all your other units are correct
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HannahC1996
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#2859
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#2859
(Original post by Suzanna5678)
Is it too early to go to bed
It is never too early to go to bed!
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BarryIsMyName
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#2860
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#2860
(Original post by Paulineuh)
Is it possible to get full UMS without getting full marks?

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Depends on the grade boundaries but yes it is


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