AQA As Biology June 2014 - [BIO2] Watch

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Hudl
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Hello Tsr

Well I made this thread as we have recently started on Unit 2 and surprisingly noone has made the thread for the AQA Biology exam. Unit 2 Biology seems to be smaller in content than Unit 1 & past pupils from my college seemed to do better on Unit 2 than 1.

I made this for anyone to share their ideas and work together and prepare for the Bio2 exam. Sharing revision notes and strategies.

I have provided some links below that can help you with revision and learning the content, most of it is just for AQA but theres the odd link where the stuff on there overlaps to another specification. This shouldn't be an issue .



http://www.biologyguide.net/
http://www.biologymad.com/
http://www.s-cool.co.uk/a-level/biology
http://www.mrothery.co.uk/ (AQA)
http://www.biology-innovation.co.uk/

http://www.thestudentroom.co.uk/wiki...Revision_Notes (Provided directly by Thestudentroom)

(Here is the spec you will be learning


If you need any other help feel free to PM me.

All the best
-Ahmed (AD)


Official exam papers for practice: (Here)

UNIT1 (BIO1 THREAD) Click here to navigate
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Unofficial Markscheme - [NOTE] - Wasnt made by me

Quote me to edit certain parts although I am revising for chem2 atm

BIOL2 JUNE 2014 UNOFFICIAL MS:
Note: not all of the answers, only the ones i could remember.
Hardest BIOL2 paper in my opinion

1)
a) [B]Define hierarchy: (1)
- Groups within groups
- No overlap between groups

b) How many families: (1)
- 3

c) Name the phylum: (1)
- Starts with C i think named
Chordata, (vertebrate)

d) Independent segregation: (2)
- Shuffling of maternal and paternal chromosomes
- leads to new/different combinations of alleles
- pair of chromosome line along equator in random orietation

e) Infertile: (2)
- homologous chromosomes cannot pair
- thus meiosis cannot occur

2a) Selective Breeding: (1)
way of improving species of crop or animal by breeding with individuals for desires/best charactersitics

b) Explain: (2)
- reduces genetic diversity
- as alleles chosen
- best alleles rejected
- leads to alleles for unfavourable characteristics being bred out of population

c) not sure

d) Describe the SD data; (2)
- SD shows spread of data around mean
- SD's do not overlap so differences are significant i.e not due to chance

3)
a) This will be the MS answer for countercurrent system:
- Water and blood flow in opposite directions/counter-current;
- maintains concentration gradient (along gill) /equilibrium not reached;
- As water always next to blood with lower concentration of oxygen;

b) Seal features: (2) B]
- Flat body surface thus small surface area to vol ratio
- less heat lost
- blubber for insulation

c) AGH thickness of lamellae: (2)
- longer diffusion pathway
- smaller SA:Vol ratio

6 marker:
How DNA is related to its function, i put:
- stable molecule due to its double helix
- strong due to the strong covalent bonds in sugar phosphate backbone
- complementary base pairing allows DNA to replicate itself when needed and pass on genetic info
- DNA is a long molecule, coiled very tightly thus store large amounts of genetic info
- has a precise genetic code, determined by sequence of bases which controls protein synthesis
- double helix protects the hydrogen bonds, thus prevents code being corrupted
- has 4 bases (named) so can code info in any order

Immunological Techniques: (3)
- Inject blood serum/protein from A into B
- Obtain antibodies
- Obtain antibodies from B and place into C
- More closely related species = more precipitate, more similar antigens and more antigen-antibody complexes

Gibbons least closely related to humans: (2)
- highest mean decrease in separation
- fewer hydrogen bonds
- shares fewer complementary bases

HSW Double blind trial (2):
a)
- prevents vested interest from scientists
- prevents bias from scientists
- prevents psychological effects from volunteers

b) question after that ^ regarding why different people had different antibody concentrations (2):
- different amounts absorbed
- differences in metabolic rates

There was one which asked to suggest a reason for the vaccine reducing the amount of smokers

My answer was - the vaccine alters the amino acid sequence responsible for creating the protein which the nicotine binds to. This alters its primary structure which leads to changes in the hydrogen/disulfide/ionic bonds, leading to alterations in the tertiary structure. As a result, the nicotine can no longer bind to the protein, so the chemicals aren't released so people see no point in smoking and stop.

Another question asked why the antibiotics shouldn't be given in higher doses.

I said about a mutation occurring which produces a resistant gene/allele which can be passed on between differebt species by means of horizontal gene transmission as the plasmid is transferred via a conjugation tube. It can also be passed between members of the same species by vertical gene transmission, leading to a higher frequency of the resistant gene and a larger population of resistant bacterium

My opinion is that the grade boundaries are going to be very very low

My predictions
Full UMS - 67/68
A - 53
B - 47
C - 42
D - 38
E - 32
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Master722
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Thank you for starting this thread. This has been really helpful.
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Hudl
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Was attempting a question in the Nelson thornes book and I dont understand how to get the write answer.

Oage 127 Q2) In a population of men the systolic blood pressure shows a normal distribution. The mean of the population is 125 and the standard deviation is 10. If the population was 1000, how many of them have a blood pressure between 115 & 135


(Original post by Master722)
Thank you for starting this thread. This has been really helpful.

No problem, how are you finding BIO2 currently
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Alleykat606
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Hi just want to ask if anyone knows if we have to learn about Okazaki fragments and DNA ligase in DNA replication for AS? Because we learned about it anyway in our lessons but I don't see it on the specification :confused:
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Delta, Δ
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Retaking this unit. Hopefully can improve on it, significantly!
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Master722
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(Original post by AhmedDavid)

No problem, how are you finding BIO2 currently
I'm really enjoying BIO2 so far, i'm finding it generally easier that BIOL1. I've done classification, variation, and DNA. DNA is the hardest thing to remeber so far.
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amytkenyon
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Has anyone done a Biology PSA based on Unit 2? any idea what to expect? I have mine on friday - doing a distance course and my tutor has been less than helpful so far!
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Hudl
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(Original post by Master722)
I'm really enjoying BIO2 so far, i'm finding it generally easier that BIOL1. I've done classification, variation, and DNA. DNA is the hardest thing to remeber so far.
Oh great, Im finding it a lot easier aswell...& its more interesting that Unit 1 it seems to me. We have nearly finished now we only have 2 chapters left.

How far ahead is your college?

(Original post by amytkenyon)
Has anyone done a Biology PSA based on Unit 2? any idea what to expect? I have mine on friday - doing a distance course and my tutor has been less than helpful so far!
Sweet is that the real EMPA or just doing the PSAs for the EMPAs.....We did one of the PSAs, Transpiration pull using a pedometer or something like that cant perfectly recall the exact name, and we also did movement of water up the xylem.
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amytkenyon
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Sweet is that the real EMPA or just doing the PSAs for the EMPAs.....We did one of the PSAs, Transpiration pull using a pedometer or something like that cant perfectly recall the exact name, and we also did movement of water up the xylem.
Just the PSA. I have the ISA a month after the PSA. I'm a little worried - have done some reading and the PSA is on respiration and enzymes - which is BIOL1. Due to some work conflicts i'm doing BIOL2 and BIOL4 this year (and BIOL3 obviously), and BIOL1 AND BIOL5 next year...

my college seems to have set my practical BIOL3 on BIOL1.... do i need to know the subject really indepth for the PSA? it obviously only gives me 3 days to learn enzymes and respiration - compared to the months i've spent on BIOL2!
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Master722
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(Original post by AhmedDavid)
Oh great, Im finding it a lot easier aswell...& its more interesting that Unit 1 it seems to me. We have nearly finished now we only have 2 chapters left.

How far ahead is your college?
Just finished everything. The last chapter for me was mitosis.
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Hudl
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(Original post by Master722)
Just finished everything. The last chapter for me was mitosis.
Same how do you plan on revising for the EMPA?
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Master722
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(Original post by AhmedDavid)
Same how do you plan on revising for the EMPA?
My school gave me a empa pack for the last 5 years of empa questions. so im getting that done. I'm also revision the topics that was listed in this upcoming empa.
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TheFootyKing19
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Hello. How is everyone's revision going?

Lets kick start the revision with some questions...

Best of luck!
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TSR Learn Together
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Hi there,

While you're waiting for an answer, did you know we have 300,000 study resources that could answer your question in TSR's Learn together section?

We have everything from Teacher Marked Essays to Mindmaps and Quizzes to help you with your work. Take a look around.

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TheAlchemistt
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Hey, im doing biol2 also. Hows it going
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FutureMedic1009
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(Original post by TheAlchemistt)
Hey, im doing biol2 also. Hows it going
Hey I am too, mines coming along now. How far along are you


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TheAlchemistt
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(Original post by FutureMedic1009)
Hey I am too, mines coming along now. How far along are you


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Done content, did a past paper got 137UMS, im really aiming for 130UMS, BIOL2 is my most important exam since i really hate BIOL5
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WillowXxx
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I don't understand standard deviation. Help!?!?!?!


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Hudl
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(Original post by WillowXxx)
I don't understand standard deviation. Help!?!?!?!


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Nothing much to understand about standard deviation, you just need to know it shows 95% of the data from the mean and thats pretty much it


& you need to know what conclusions to make with graphs with standard deviation bars
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WillowXxx
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(Original post by AhmedDavid)
Nothing much to understand about standard deviation, you just need to know it shows 95% of the data from the mean and thats pretty much it


& you need to know what conclusions to make with graphs with standard deviation bars
Thanks what conclusions can you make from a standard deviation graph?


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