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x-Sophie-x
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#3041
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#3041
(Original post by James A)
looooool I ain't doing this exam.

best of luck to all though.
Oops.
Ha, then why are you on this thread? >.<

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oak12
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#3042
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#3042
(Original post by MrPolish)
do you have to know all of the main arteries and veins, i.e. Hepatic artery, renal artery etc..?
what you need to know:

to the liver is hepatic artery, away from it is the hepatic vein

to the kidney is renal artery, away from it is the renal vein

the hepatic portal vein runs from small intestine to liver
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x-Sophie-x
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#3043
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#3043
(Original post by MrPolish)
do you have to know all of the main arteries and veins, i.e. Hepatic artery, renal artery etc..?
Yep we do.

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moa7
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#3044
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#3044
(Original post by oak12)
anyone need any help?

questions or topics?
Could you explain genetic bottleneck and the founder effect please and it's effects etc??

Also, can you please help me on question 4c on this paper. i'm not too sure how to do it: http://filestore.aqa.org.uk/subjects...2-QP-JUN12.PDF

Thanks
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starfish232
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#3045
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#3045
(Original post by oak12)
anyone need any help?

questions or topics?
This is just me just double checking. At lower partial pressure of oxygen, hameoglobin has higher affinity for oxygen and at higher partial pressure of oxygen, haemoglobin has lower affinity for oxygen.

Also, could just go over cohesion tension and root pressure.
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MrPolish
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#3046
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#3046
(Original post by oak12)
what you need to know:

to the liver is hepatic artery, away from it is the hepatic vein

to the kidney is renal artery, away from it is the renal vein

the hepatic portal vein runs from small intestine to liver
right thank you
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chelley2
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#3047
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#3047
(Original post by oak12)
anyone need any help?

questions or topics?
Why are patients told to take antibiotics over a course of 6months?


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TheGeneral95
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#3048
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#3048
For the bottom left is it meant HO or OH ?

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MrPolish
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#3049
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#3049
(Original post by x-Sophie-x)
Yep we do.

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thank you
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x-Sophie-x
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#3050
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#3050
(Original post by oak12)
as the column water is pulled up the xylem, the walls of the xylem are pulled inwards due to adhesion, this is called tension, and causes the diameter of the tree trunk to reduce. it is also negative pressure.

root pressure pushes on column of water - it would normally produce positive pressure (pushes wall of xylem outwards)
Oh wait so root pressure is positive? And cohesion tension is negative?

How do you know?

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MrPolish
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#3051
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#3051
you know when you have the glycosidic bond between a beta glucose.. which H joins with which OH. Does it matter at all?
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ImAz
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#3052
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#3052
Would this be an adequate explanation as to the effect of CO2 on Hb affinity for O2?

-CO2 is absorbed by the red blood cells at the respiring tissues, hence making them more acidic.
-A decrease in pH decrease the haemoglobin's affinity for oxygen.
-this explains why at respiring tissues oxygen dissociates more readily because there is a high concentration of CO2


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oak12
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#3053
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#3053
(Original post by moa7)
Could you explain genetic bottleneck and the founder effect please and it's effects etc??

Also, can you please help me on question 4c on this paper. i'm not too sure how to do it: http://filestore.aqa.org.uk/subjects...2-QP-JUN12.PDF

Thanks
genetic bottleneck is when an environmental disaster leads to a large reduction in population size, hence, a reduction in variety of alleles

founder effect is when a few individuals become isolated, they interbreed and repopulate, all their offspring will have that limited range of alleles, hence reduced variety of alleles
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oak12
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#3054
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#3054
(Original post by moa7)
Could you explain genetic bottleneck and the founder effect please and it's effects etc??

Also, can you please help me on question 4c on this paper. i'm not too sure how to do it: http://filestore.aqa.org.uk/subjects...2-QP-JUN12.PDF

Thanks
4c:

interphase lasts for 90%

so mitosis lasts for 10%

10% of 20 hours is 2 hours
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F1's Finest
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#3055
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#3055
(Original post by x-Sophie-x)
Oops.
Ha, then why are you on this thread? >.<

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Just to pop in and see how you guys are faring!

I did this exam in Jan and got an A, so I'm leaving it there! haha
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Thebest786
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#3056
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#3056
(Original post by 2013leaver)
Rolling up leaves traps a layer of stiil air, reducing the water potential gradient between the stomata and surrounding air, reducing transpiration.

Light only causes stomata to open, nothing else. stomata must be open for transpiration
What about stomata in pits

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oak12
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#3057
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#3057
(Original post by starfish232)
This is just me just double checking. At lower partial pressure of oxygen, hameoglobin has higher affinity for oxygen and at higher partial pressure of oxygen, haemoglobin has lower affinity for oxygen.

Also, could just go over cohesion tension and root pressure.
no,

at high partial pressure of oxygen, haemoglobin has a higher affinity, like in the lungs

at low partial pressure of oxygen, haemoglobin has a low affinity, like in the respiring tissues
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Camellama
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#3058
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#3058
how many marks out of 85 do you usually have to get for 140/140 ?
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oak12
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#3059
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#3059
(Original post by chelley2)
Why are patients told to take antibiotics over a course of 6months?


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this is for TB

its the time required to kill all bacteria (non resistant and resistant)
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Thebest786
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#3060
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#3060
(Original post by Camellama)
how many marks out of 85 do you usually have to get for 140/140 ?
About 72

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