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aloha_
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#3001
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#3001
(Original post by Thebest786)
Guys can anyone tell me water from which pathway(apoplastic or symplastic) goes straight through and which stops at the casparian strip

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Apoplastic stops at the casparian strip and is forced to join the water from the symplastic pathway, which goes straight through the cytoplasm
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x-Sophie-x
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#3002
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#3002
(Original post by James A)
Good luck to you guys tomorrow, I'll keep you guys in my thoughts when revising for my Unit 2 Chemistry exam (edexcel) haha.

Is this a PM or morning exam for you lot?
Good luck xD

AM for me :/

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Thebest786
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#3003
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#3003
(Original post by aloha_)
Apoplastic stops at the casparian strip and is forced to join the water from the symplastic pathway, which goes straight through the cytoplasm
Thanks

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BingTaoBing
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#3004
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(Original post by Thebest786)
Guys can anyone tell me water from which pathway(apoplastic or symplastic) goes straight through and which stops at the casparian strip

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Apoplast 'stops' at the Casparian strip and the water goes into one of the endothelial cells.
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bellaanne
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#3005
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#3005
good luck to everyone who is sitting this exam, i sat this exam last year
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Eterniity
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#3006
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#3006
(Original post by elliewoodheadx)
why is it better to compare base sequences of organisms rather than amino acids? Just because of introns?
and there is a longer base sequence so more comparisons can be made
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Sambird369
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#3007
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#3007
Panic!! Ghaaadd


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BingTaoBing
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#3008
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#3008
(Original post by radicccal)
Hi, please can someone help...
You know when you're asked about the loading transport and unloading of oxygen do you write about the pH of CO2 or the p.O2 of oxygen??
Mainly the partial pressure of oxygen. BUT, presence of CO2 causes the haemoglobin molecule to change shape and so it has a lower affinity for oxygen and releases oxygen more readily into the cells. So there are two things to mention. When talking about loading oxygen in the lungs, talk about the partial pressure of O2. If respiration is involved, talk about CO2.
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Melissajwilson
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#3009
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#3009
Go to bed good luck everyone


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Manni
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#3010
(Original post by lorobolorolo)
Lool it doesn't liven up ur mood if u don't get a reply from her. Might as well wait until the exams are over and then this depressing mood will be gone
She replied back
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StudentInNeed!
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#3011
(Original post by JM17)
Doing so maximises surface area. This maximised surface area increases the rate at which exchange of water can occur via osmosis.
Also more importantly prevents the xylem from crushing
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Juwairiyah
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#3012
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#3012
(Original post by annaelizabet)
no it isn't :P it is mochokus nilo thingy, i don't know why!

because its asking for the most distantly related species, if you look at the tree, the branch that's furtherst away from Synodontis membranacea is Mochokus niloticus
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oak12
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#3013
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#3013
(Original post by radicccal)
Hi, please can someone help...
You know when you're asked about the loading transport and unloading of oxygen do you write about the pH of CO2 or the p.O2 of oxygen??
both:

loading = high pp of oxygen and low pp of co2
unloading = low pp of oxygen and high pp of co2
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radicccal
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#3014
(Original post by BingTaoBing)
Mainly the partial pressure of oxygen. BUT, presence of CO2 causes the haemoglobin molecule to change shape and so it has a lower affinity for oxygen and releases oxygen more readily into the cells. So there are two things to mention. When talking about loading oxygen in the lungs, talk about the partial pressure of O2. If respiration is involved, talk about CO2.
Thanks!!
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LiamDaly
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#3015
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#3015
If anybody knows the possible 6 mark questions for the plant?

How water enters root hair?
The apoplastic and symplastic pathway?
How water travels up the xylem?

Please?


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iamNatasha
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#3016
(Original post by senz72)
The problem is I dropped bio (parents want an A in AS) and so it's like learning everything as new content.
Whoa! I would never be able to do that... I feel for ya brah. Good luck!
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oak12
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#3017
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#3017
(Original post by elliewoodheadx)
why is it better to compare base sequences of organisms rather than amino acids? Just because of introns?
contains:

- introns
- stop and start codons
- each base has more then one triplet code
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F1's Finest
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#3018
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#3018
(Original post by x-Sophie-x)
Good luck xD

AM for me :/

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looooool I ain't doing this exam.

best of luck to all though.
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Thebest786
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#3019
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#3019
(Original post by BingTaoBing)
Apoplast 'stops' at the Casparian strip and the water goes into one of the endothelial cells.
Once it stops, does it go through the xylem after? And the symplast goes straight to the xylem?

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aloha_
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#3020
I really hope the 6 marker is bacterial resistance
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