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AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

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Original post by appleschnapps
Ew, I just did the specimen paper. Everything was going fine, and then suddenly APPLICATION QUESTION. I got like 4 marks out of 15. :frown:


Thats not bad, an A was 62% last year. Thats the only thing keeping me going at the moment.
My whole chem5 unit took up around 7 cards to write short revision notes on.

Biol5 has taken up 24. Snm.
Hi again all :biggrin:
I have been trying to plan a few essay questions, but I have gotton stuck on some as there appears to be very little to write about. I'm going to post them all and what I have written down for them, and then if you have any further ideas you can add to them?:

1. Nitrogen
-The nitrogen cycle
- The effect of nitrogen fertilisers and eutrophication

2. Transfers through organisms:
- Energy transfers
- Digestive system

3. Importance of water
- Respiration
- Transpiration
- Water potential and osmosis
- Transport in a plant
(I also know it is needed for photosynthesis, but I can't remember where it directly comes in?)

4. Surface area
- Gas exchange surfaces
- Homeostasis

5. Hydrogen
- Hydrogen bonds - DNA

6. Importance of plants
- Photosynthesis
- Deforestation and global warming
- Producers and food chains
- Crop yields

7. Structure of proteins
- Amino acids - translation
- Structures - polypeptide chain, secondary, tertiary and quaternary structures.

So if you have any more points on any of the above topics can you PLEASE post them? I'm struggling a bit here!
Reply 1023
Avatar for -Iffy-
-Iffy-
From the old specification, to see which units are relevant to the new spec, I've got the Collin's book for Module 4- Energy, control and continuity (byb4) which has:
Survival and coordination,
Homeostasis,
Nervous coordination,
Muscles.

Just searched for the old spec on the internet,
Module 8- behaviour and populations (byb8) has:
Patterns of behaviour - taxis and kinesis and reflex actions, reproductive behaviour - includes the FSH, LH, progesterone, oestrogen stuff,
Human populations and health - includes screening programmes.

Module 2 - genes and genetic engineering (byb2) has:
The genetic code - includes protein synthesis and mutation,
Application of gene technology- includes genetic engineering, the PCR reaction, GM organisms, genetic markers and gene therapy and cystic fibrosis

Module 3 - physiology and transport (byb3) has:
Energy and exercise - includes energy sources (glucose) and muscle fatigue (lactate)

That's about 7 of the 8 chapters (chapters 9-14 and 16) covered I think. Basically if people want to do past paper questions, units BYB2, BYB4 and BYB8 and a little bit of BYB3 cover most of the content. But does anyone know which old spec modules cover chapter 15 in our new spec? The totipotency and cell specialisation?

Geez, here I was thinking, the content of biol 5 was covered in 1 or 2 units from the old spec :/
(edited 12 years ago)
Reply 1024
Avatar for m_wooly
m_wooly
Bio 5 is just a monster. Nothing to complicated, just a lot to cram in. Including useless rubbish this genetic counselling... learning about that just angered me :P.
hey people, jus wanted to know bacteria cant splice out introns so is the gene that is inserted already spliced, this would mean it would be produced be reverse transcriptase right? because this already has spliced out the introns, and if so how is this gene produced by reverse transcriptase inserted into a plasmid if its isolated by reverse transcriptase rather than restirction endonuclease??

also does this mean that in vivo gene cloning always involves reverse transcriptase?
Reply 1026
Avatar for WJD
WJD
What were the grade boundaries for this the past couple of years?
hey also one more question with the antibiotic markers why dont you just test whether the plasmids have resistance for tetracycline straight away without hving to do the ampicilllin thing?
Original post by WJD
What were the grade boundaries for this the past couple of years?


I could only find June 2010. Out of a total of 100:
A* - 69
A - 62
B - 55
C - 49
D - 43
E - 37
Reply 1029
Avatar for OhNo_23
OhNo_23
5
Original post by angel1992
hey also one more question with the antibiotic markers why dont you just test whether the plasmids have resistance for tetracycline straight away without hving to do the ampicilllin thing?


The ampicillin is to destroy the bacteria that have not taken up the plasmid. Only those that have the plasmid have the gene with resistance to ampicillin.
Original post by OhNo_23
The ampicillin is to destroy the bacteria that have not taken up the plasmid. Only those that have the plasmid have the gene with resistance to ampicillin.


oh yeah makes sense, so basically if you didnt use ampicillin, and jus tetracycline, then the ones that have taken up the plasmid with the gene would die but the ones that havent taken up the plasmid would survive ooh,, okk makes sense so its jst easier to get rid off them first without having to extract them etc
who on earth got 69 in june 10 its impossible
i got 35 on the june 10 but that was with no revision at all
i hope the grade boundaries are lower cos im sure everyone knws what aqa are like and its unlikely that this exam will be easier than june 10:frown:
most of my exams havent gone aswel as ive expected them too
well apart from chem2,stats and mechanics 1
Reply 1032
Avatar for OhNo_23
OhNo_23
5
Original post by angel1992
oh yeah makes sense, so basically if you didnt use ampicillin, and jus tetracycline, then the ones that have taken up the plasmid with the gene would die but the ones that havent taken up the plasmid would survive ooh,, okk makes sense so its jst easier to get rid off them first without having to extract them etc


No, the ones without the plasmid would also die because it doesn't have resistance to tetracycline either. So you wouldn't be able to distinguish between those with no plasmid and the transformed bacteria.
So essentially ampicillin is used to eliminate those without the plasmid (so with no resistance to either of the durgs), and then tetracycline is used to destroy those with the plasmid and the desired gene, so they can be identified.
Hope this makes sense! :smile:
Original post by OhNo_23
No, the ones without the plasmid would also die because it doesn't have resistance to tetracycline either. So you wouldn't be able to distinguish between those with no plasmid and the transformed bacteria.
So essentially ampicillin is used to eliminate those without the plasmid (so with no resistance to either of the durgs), and then tetracycline is used to destroy those with the plasmid and the desired gene, so they can be identified.
Hope this makes sense! :smile:


oh yeah stupid me, i thought so!!!! thats what i was writing at first when i was replying to you, ahhhhhh that makes way more sensee!!!! thanku
do bacteria have introns?
Could anyone please explain how to interpret graphs on the menstrual cycle please?
Original post by Sparkly-Star
Could anyone please explain how to interpret graphs on the menstrual cycle please?


Do you know how the menstrual cycle works? Like it's steps?
Original post by Cyanohydrin
Do you know how the menstrual cycle works? Like it's steps?


Yeah I remember the steps but when I get questions with graphs on it or even for other animals then I don't know how to do it tbh. :frown:
Original post by angel1992
do bacteria have introns?


The frequency of introns within different genomes is observed to vary widely across the spectrum of biological organisms. For example, introns are extremely common within the nuclear genome of higher vertebrates (e.g. humans and mice), where protein-coding genes almost always contain multiple introns, while introns are rare within the nuclear genes of some eukaryotic microorganisms,[7] for example baker's yeast (Saccharomyces cerevisiae). In contrast, the mitochondrial genomes of vertebrates are entirely devoid of introns, while those of eukaryotic microorganisms may contain many introns. Introns are well-known in bacterial and archaeal genes, but occur more rarely than in most eukaryotic genomes.


Yes, but they are more rare.
Original post by Sparkly-Star
Yeah I remember the steps but when I get questions with graphs on it or even for other animals then I don't know how to do it tbh. :frown:




What don't you undertstand on that graph? :smile:

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