AQA BIOL2 ~ 21 May 2012 ~ AS Biology
Biology exam discussion - share revision tips in preparation for GCSE, A Level and other biology exams and discuss how they went afterwards.
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologydo you do ocr b salters chemistry and atm im just copying out my cgp guide on xylems and pholems and water transport in plants its hard work(Original post by Mocking_bird)
Ah I know what you mean - its the HSW questions which keep getting me
Chemistry is going okay, just been making some flash cards for it today as i'm running out of revision ideas
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyWe don't need to know anything about phloem... do we?(Original post by dongonaeatu)
do you do ocr b salters chemistry and atm im just copying out my cgp guide on xylems and pholems and water transport in plants its hard work
& I do AQA Chem. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologywhat about xylem(Original post by Mocking_bird)
We don't need to know anything about phloem... do we?
& I do AQA Chem.
oh ok i do ocr b salters chemistry its hard -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologywhat is on the specification then(Original post by Tullia)
No, it isn't on the specification. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biology(Original post by dongonaeatu)
what is on the specification thenThat is what the specification states for the bit you're referring to.The structure of a dicotyledonous root in relation to the pathway of water from root hairs through the cortex and endodermis to the xylem. Apoplastic and symplastic pathways.
Transpiration and the effects of light, temperature, humidity and air movement.
The roles of root pressure and cohesion-tension in moving water through the xylem. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologywhat is a dicotyledonous root(Original post by Tullia)
That is what the specification states for the bit you're referring to. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyIt is the root of a dicotyledonous plant.(Original post by dongonaeatu)
what is a dicotyledonous root -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologyyes but what is a dicotyledonous plant(Original post by Tullia)
It is the root of a dicotyledonous plant. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biology(Original post by Mocking_bird)
Simply... The effect of CO2.
In more detail...
The Bohr Effect:
- Muscle cells respire more rapidly, producing large amounts of CO2.
- The increase in CO2 means the curve moves to the right.
- Haemoglobin has a lower affinity to oxygen so can release more oxygen to respiring cells at a given partial pressure
How its caused:
- The reason it has this lower affinity is the ability of the haemoglobin to change shape.
- This is caused by the increased concentration of CO2 dissolved in the blood which decreases the pH.
Do you think another possible marking point could be that it changes shape due to hydrogen ions (protons) interacting with the ionic bonds of the tertiary structure of haemoglobin?
You're producing some amazing answers on this thread, btw!
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologyyes(Original post by cheesecake11)
do we need to know the names of the blood vessels entering the livers and kidneys? -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyNot sure if it's on spec (but I think it is).(Original post by cheesecake11)
do we need to know the names of the blood vessels entering the livers and kidneys?
Aorta --> Liver = Hepatic Artery.
Aorta --> Kidneys = Renal Arteries.
Gut (Small intestine) --> Liver = Hepatic Portal Vein. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyA plant with two embryonic leaves.(Original post by dongonaeatu)
yes but what is a dicotyledonous plant
It's irrelevant though. You just need to know the structure of the root. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyAnd the structure of the leaf of a dicotyledonous plant as well, or was that just my teacher telling us we need to know it for the exam, but it's really just 'wider knowledge'?(Original post by Tullia)
A plant with two embryonic leaves.
It's irrelevant though. You just need to know the structure of the root. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyIf your teacher has told you to learn something, then I'm in no position to say otherwise.(Original post by thegodofgod)
And the structure of the leaf of a dicotyledonous plant as well, or was that just my teacher telling us we need to know it for the exam, but it's really just 'wider knowledge'? -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyI don't really know(Original post by thegodofgod)
Do you think another possible marking point could be that it changes shape due to hydrogen ions (protons) interacting with the ionic bonds of the tertiary structure of haemoglobin?
You're producing some amazing answers on this thread, btw!
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I would presume yes, since the decrease in pH causes it to turn acidic and hence what you said.
& Thanks, will rep back.
Yup, like thegodofgods said, the hepatic (liver), renal (kidneys), and hepatic portal vein(small intestine to liver).(Original post by cheesecake11)
do we need to know the names of the blood vessels entering the livers and kidneys?
There was a question on the june 09 paper which had a diagram of it and you were asked which was the hepatic portal vein. However, so far, I havent come across a question asked about the others - but i'd just make sure you know just in case its been waiting to come up for us. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS Biologydo we need to know where they come from the hepatic and all that and whether its oxygenated or deoxygenated(Original post by Mocking_bird)
I don't really know I would presume yes, since the decrease in pH causes it to turn acidic and hence what you said.
& Thanks, will rep back.
Yup, like thegodofgods said, the hepatic (liver), renal (kidneys), and hepatic portal vein(small intestine to liver).
There was a question on the june 09 paper which had a diagram of it and you were asked which was the hepatic portal vein. However, so far, I havent come across a question asked about the others - but i'd just make sure you know just in case its been waiting to come up for us. -
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Re: AQA BIOL2 ~ 21 May 2012 ~ AS BiologyTheres a diagram in the CGP book... I think.(Original post by dongonaeatu)
do we need to know where they come from the hepatic and all that and whether its oxygenated or deoxygenated
