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amber206
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#1
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#1
Feeling we need a new one seeing as the one for Jan 2013 is insanely long.

Anyone have any feeling on what may or may not come up next week?
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Legal drugdealer
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#2
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#2
(Original post by amber206)
Feeling we need a new one seeing as the one for Jan 2013 is insanely long.

Anyone have any feeling on what may or may not come up next week?
````````````````

Biology is a madness soo much to remember!

I just dont want cell cycle and translocation to come up everything else should be ok
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amber206
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#3
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#3
What is the point of blocking the apoplast pathway by the Casparian strip?

I know it means that NO3-ions etc. get actively transported into the xylem, so water can follow by osmosis, but why?

Is it because the apoplast pathway doesn't connect to the xylem or something, so if that pathway is taken then water won't end up in the xylem?
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Stephan89
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#4
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#4
(Original post by amber206)
What is the point of blocking the apoplast pathway by the Casparian strip?

I know it means that NO3-ions etc. get actively transported into the xylem, so water can follow by osmosis, but why?

Is it because the apoplast pathway doesn't connect to the xylem or something, so if that pathway is taken then water won't end up in the xylem?
The casparian strip ensures that water has to pass through a plasma membrane, which are selectively permeable, before it can enter the xylem. This is so that the cells/plant can control what substances enter the xylem and filter out any unwanted substances in the water.

I really wish this was the 50% paper, because I'm dreading F212.
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Caribbeantwist
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#5
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#5
F211 is so wishy washy! Has anyone done the jan 13 paper it's awful!!


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amber206
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#6
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#6
(Original post by Stephan89)
The casparian strip ensures that water has to pass through a plasma membrane, which are selectively permeable, before it can enter the xylem. This is so that the cells/plant can control what substances enter the xylem and filter out any unwanted substances in the water.

I really wish this was the 50% paper, because I'm dreading F212.
F212 coupled with unit 2 of Edexcel chemistry after half term will be the bane of my existance D:
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calla_lily
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#7
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#7
(Original post by amber206)
F212 coupled with unit 2 of Edexcel chemistry after half term will be the bane of my existance D:
Haha, I'm doing exactly the same. Haven't really started either yet though, had too many other exams. Half term will not be fun!!
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amber206
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#8
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#8
(Original post by calla_lily)
Haha, I'm doing exactly the same. Haven't really started either yet though, had too many other exams. Half term will not be fun!!
Same. I think I'm going to barricade myself in my room with a kettle, coffee, food and books. Agh it's actually quite bleak.
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repugn
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#9
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#9
What do you guys think about the probability of cell cycle, bohrs shift and fetal haemoglobin, tissue blood and lymph and specialised cells coming up?
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kited4
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#10
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#10
i think mitosis will come up i also notice there hasnt been a long question about the oxygen dissociation curve or the process which takes place in the red blood cells...
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repugn
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#11
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#11
(Original post by kited4)
i think mitosis will come up i also notice there hasnt been a long question about the oxygen dissociation curve or the process which takes place in the red blood cells...
yeah im thinking that too, so much little things to remember that could cost you so many marks on the questions its a pain
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BioGeek
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#12
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#12
buzzing for this exam!
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otrivine
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#13
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#13
(Original post by BioGeek)
buzzing for this exam!
want to revise chapter 1 and 2
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otrivine
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#14
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#14
Anyone up for revision on chapters 1 and 2
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BioGeek
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#15
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#15
(Original post by otrivine)
Anyone up for revision on chapters 1 and 2
Yep lets do loads.

How are root hair cells specialized for its function? (4)
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otrivine
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#16
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#16
(Original post by BioGeek)
Yep lets do loads.

How are root hair cells specialized for its function? (4)
Root hair cells have lots of mitochondria as they are metabolically active and carry out aerobic respiration and need energy in the form of ATP.

Root hair cells have thin walls in order to allow oxygen is diffuse into the root hair cell during daytime and helps to contribute for process of photosynthesis .

In addition root hair cells have a large surface area ( to volume ratio) and so this means more water moves into root hair cells and allows efficient gas exchange.
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amber206
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#17
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#17
(Original post by BioGeek)
Yep lets do loads.

How are root hair cells specialized for its function? (4)
Large SA:V ratio so more nutrients can be taken up.
Have channel and carrier proteins so that nutrients, eg NO3- ions may enter the cell.
Many mitochondria, which release ATP, which is required for active transport (taking up nutrients is an active process)
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otrivine
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#18
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#18
(Original post by amber206)
Large SA:V ratio so more nutrients can be taken up.
Have channel and carrier proteins so that nutrients, eg NO3- ions may enter the cell.
Many mitochondria, which release ATP, which is required for active transport (taking up nutrients is an active process)
ask me question
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CurtisDean
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#19
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#19
Hey evweryone

I am confused - is the inspiratory reserve above the tidal volume or below the tidal volume wave?
And what is the reason for it? Thanks
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amber206
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#20
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#20
(Original post by otrivine)
ask me question
How is the structure of an artery related to its function?
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