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rm.xo
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#4881
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#4881
(Original post by TauMuon)
My advice: don't stress over the essay! Concentrate on the rest of the exam, it's worth 3 times as many marks


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That's what I've been telling myself hahaha
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rm.xo
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#4882
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#4882
(Original post by hype)
Last minute essay tips, anyone?


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Stay calm.
read the question properly.
read all the information before powering through the question.
if you're stuck, don't dwell on the question. Come back to it.
think logically and apply the specifics of your knowledge.
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Eloades11
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#4883
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#4883
Just to let you all know, I'm not taking the exam myself, I'm currently doing a degree in biology and I have my own exam this afternoon but I will help you all out as much as I can before your exam!

Best of luck everyone!
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Tikara
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#4884
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#4884
(Original post by rm.xo)
rubisco in Calvin cycle.
DNA helicase, polymerase and ligase in transcription.
ATPase in muscle contraction
Lipases and other enzymes secreted by saprobiotic bacteria
dehydrogenase to oxidise co enzymes
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persian-boy
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#4885
(Original post by lcj0503)
Anyone else doing the essay first??


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i would look at the essay topics and i will choose one of them before i do the other question but i wont definately do the essay first!!essay is only 25 marks out of 100!!get others out of the way and than focus on ur essay!!GOOOOD LUCK
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Tikara
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#4886
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#4886
(Original post by Eloades11)
Just to let you all know, I'm not taking the exam myself, I'm currently doing a degree in biology and I have my own exam this afternoon but I will help you all out as much as I can before your exam!

Best of luck everyone!
ahh thats why you knew so much :P
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anniedink
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#4887
(Original post by Eloades11)
You could write about it's role in photosynthesis, eg for photolysis. I'm sure you also know about osmosis and water involved in respiration.
Any chance you could summarise the involvement of water in the unit 4 stuff? I didn't get round to revising unit 4.
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Tikara
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#4888
(Original post by persian-boy)
i would look at the essay topics and i will choose one of them before i do the other question but i wont definately do the essay first!!essay is only 25 marks out of 100!!get others out of the way and than focus on ur essay!!GOOOOD LUCK
I'm gonna smash the exam in like 45 mins, check - then spend the rest of the time just writing everything I've ever learnt into the essay haha
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paul343
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#4889
Can anyone explain ci to me? I'm stumped. Name:  ImageUploadedByStudent Room1371464908.984861.jpg
Views: 156
Size:  170.9 KB

My answers pretty rubbish so just ignore it ahah


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rm.xo
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#4890
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#4890
(Original post by lcj0503)
Anyone else doing the essay first??


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I wouldn't recommend doing that. If you get panicked over the essay then you may mess up the questions. But if you do, remember to keep an eye on the time and that the questions are worth 3x the amount that the essay is.
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Eloades11
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#4891
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(Original post by Tikara)
ahh thats why you knew so much :P
Yeah I'm not here to intimidate you all I've been studying biology for a few more years

(Original post by anniedink)
Any chance you could summarise the involvement of water in the unit 4 stuff? I didn't get round to revising unit 4.
Sorry I don't know what was covered in unit 4. But if you had an essay on water, then some simple things you could write about include osmosis, and photosynthesis.
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rm.xo
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#4892
(Original post by paul343)
Can anyone explain ci to me? I'm stumped. Name:  ImageUploadedByStudent Room1371464908.984861.jpg
Views: 156
Size:  170.9 KB

My answers pretty rubbish so just ignore it ahah


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somebody used this before...

undigested DNA

----------

completely digested DNA

--
---
-----

partially digested DNA

--
---
-----
----------

therefore the partially digested DNA adds upto more than that of the origional
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rommy123
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#4893
goshh im soo nervous! hope this paper is similar to last years, and AQA give us a good essay to do.
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Eloades11
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#4894
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#4894
(Original post by paul343)
Can anyone explain ci to me? I'm stumped. Name:  ImageUploadedByStudent Room1371464908.984861.jpg
Views: 156
Size:  170.9 KB

My answers pretty rubbish so just ignore it ahah


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Electrophoresis separates fragments of DNA based on their size, the smaller fragments will move further whilst the larger fragments (containing more bp's of DNA) will not move as much. You could then compare the distance traveled to a table of data and estimate the size/how many base pairs there are.
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SarahM-801
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(Original post by ans16)
can someone please explain question 3d i http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
I think 3.d.i. is looking for the differences between the cuticles, so the upper cuticle is usually thicker and waterproof to reduce transpiration, so it's harder for NAA to diffuse through it.. thicker I'd assume means longer diffusion pathway, so slower rate of diffusion/uptake.
3.d.ii. Different species would have slightly different leaf structures such as more/fewer stomata, or thicker/thinner cuticles.
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lcj0503
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#4896
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#4896
(Original post by rm.xo)
I wouldn't recommend doing that. If you get panicked over the essay then you may mess up the questions. But if you do, remember to keep an eye on the time and that the questions are worth 3x the amount that the essay is.
Oh maybe I shouldn't do that then I was just scared about running out of time. I might do all questions I find easiest on the paper then the essay then go back to the more difficult questions if time allows that way I'm not wasting time on difficult questions leaving less for the essay! So nervous!! :-((


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paul343
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#4897
(Original post by rm.xo)
somebody used this before...

undigested DNA

----------

completely digested DNA

--
---
-----

partially digested DNA

--
---
-----
----------

therefore the partially digested DNA adds upto more than that of the origional
No that's not the question haha you answered the question before this one


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helpme456
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#4898
can anyone summarise gene therapy please?
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paul343
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#4899
(Original post by Eloades11)
Electrophoresis separates fragments of DNA based on their size, the smaller fragments will move further whilst the larger fragments (containing more bp's of DNA) will not move as much. You could then compare the distance traveled to a table of data and estimate the size/how many base pairs there are.
Thanking you


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anniedink
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(Original post by Eloades11)
Yeah I'm not here to intimidate you all I've been studying biology for a few more years



Sorry I don't know what was covered in unit 4. But if you had an essay on water, then some simple things you could write about include osmosis, and photosynthesis.
All of the photosynthesis stages like the krebs cycle and stuff, i just wanted to know the involvement of water in LIR and LDRs
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