AQA A2 BIOL5 22nd June 2012

Can anyone expand on what I wrote for this essay, "The role of movement of substances across membranes in the functions of organs and systems"

So far what I wrote about which was 3 sides, so enough but I just want a few more possible topics I could have used. Mine were; Absorption of water and nitrates etc with expansion of water movement across cortex and endodermis to xylem. Then how water enters mesophyll cells and into chloroplasts, used in the LDR by water photolysis etc. Then how they use glucose from cells to produce starch to form biomass. I then linked the paragraphs, by consumers eating plant etc glucose absorbed in intestine by co-transport etc. Then brief detail on respiration and discussing H+ ion movement across mitochondria membrane produce ATP via ATP synthase etc. Then I talked about neurones at neuromuscular junction, movement of Na+ to form AP and then neurotransmitter movement across membranes transmits impulse to a muscle fibre where this allows muscles to carry out function of contraction etc. Then my final point was oestrogen movement across membrane (phospholipid) to bind to receptor site on transcriptional factor to then remove inhibitor etcetc to stimulate trancription of gene, then why its important etcetc. SO ALL THIS IN A LOT MORE DETAIL (Like writing the essay again!)

So yeah any more ideas??

I did this essay, I managed to get in all of the four units in 45 mins

The only thing I would add to this would be about gas exchange in the lungs - Oxygen diffusing from the alveoli across the alveolar and capillary epithelia and into the haemoglobin in the blood.

I did this essay, I managed to get in all of the four units in 45 mins

The only thing I would add to this would be about gas exchange in the lungs - Oxygen diffusing from the alveoli across the alveolar and capillary epithelia and into the haemoglobin in the blood.

Can anyone expand on what I wrote for this essay, "The role of movement of substances across membranes in the functions of organs and systems"

So far what I wrote about which was 3 sides, so enough but I just want a few more possible topics I could have used. Mine were; Absorption of water and nitrates etc with expansion of water movement across cortex and endodermis to xylem. Then how water enters mesophyll cells and into chloroplasts, used in the LDR by water photolysis etc. Then how they use glucose from cells to produce starch to form biomass. I then linked the paragraphs, by consumers eating plant etc glucose absorbed in intestine by co-transport etc. Then brief detail on respiration and discussing H+ ion movement across mitochondria membrane produce ATP via ATP synthase etc. Then I talked about neurones at neuromuscular junction, movement of Na+ to form AP and then neurotransmitter movement across membranes transmits impulse to a muscle fibre where this allows muscles to carry out function of contraction etc. Then my final point was oestrogen movement across membrane (phospholipid) to bind to receptor site on transcriptional factor to then remove inhibitor etcetc to stimulate trancription of gene, then why its important etcetc. SO ALL THIS IN A LOT MORE DETAIL (Like writing the essay again!)

So yeah any more ideas??

What do you need in unit 5 UMS wise to get into uni?

Can anyone tell me in detail what the ribosome does in protein synthesis... I don't understand it unless its detailed lol thanks


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How is everyone revising for the essay considering its synoptic!
are people revising important topics from all units or just going in with unit 5 knowledge and hoping they remeber other topics haha

any help would be much appreciated ..

Could someone link me to the ms for the specimen paper?

I can't seem to find it :/

Any ideas on what to write for "DNA and information transmission"?

Here you are

http://www.thomas-reddington.com/uploads/7/7/8/3/778329/bio_u5_ms_specimen.pdf

Thanks




I think you can only sit unit 5 in June

Well I need 106 at the most in unit 5 for an A overall (and i need an A for my firm choice - Biomedicine at UEA), however I resat unit 2 and I thought that went really well so I could need less than 106 if I improve my unit 2 score.

I am just going to go for an A though as I think I can get one in this unit

How about yourself?

Same I retook unit 2 as well! Got 119 before, hoping for more! I messed up the antibiotic question though :/ What did you get in unit 2 before?

I need same you in unit 5 as well! To get an A for my medicine offer at Newcastle University

does anyone have a good definition for a tactic response or a kinetic response (the one in the revision guide is crap)