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AQA A-level Biology Unit 1 26th May 2016

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Original post by CourtlyCanter
Mate the revision guide itself advertises this on its front cover- 'Checked by an AQA Principal Examiner'

Hope we both get the marks.


Why would they allow another answer

When the ester bond is broken by hydrolysis it produces and alcohol and carboxylic acid

Glycerol - alcohol
Fatty acid contains a carboxylic acid group which causes a Dec in ph
Original post by yourmatej
yeah thats what i meant. would that be right baby?


Well yeah because that's the correct answer, triglycerides are the limiting factor


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Original post by theambitiousguru
Why would they allow another answer

When the ester bond is broken by hydrolysis it produces and alcohol and carboxylic acid

Glycerol - alcohol
Fatty acid contains a carboxylic acid group which causes a Dec in ph


You had to burst his bubble.
Original post by studynerd4
2.8um


Perfect thought it was to simple to be true
Original post by yourmatej
for what they shouldn't eat i put foods containing lactose (e.g. dairy products), since they were measuring the symptoms of lactose intolerance remember other sugars would not effect the results and cause symptoms? not sure tho


I just put not to eat dairy products, would that be sufficient for the marks?
If you checked the diagram of the mitochondria given in the exam today it showed a piece of circular DNA inside the matrix of the mitochondria, you can also check the structure of mitochondria online and it will show the same Circular DNA, however i think your answers are correct too
Original post by theambitiousguru
Why would the enzyme denature it was at 20 degrees? So it wouldn't denature..
Triglycerides limiting factor more correct

I put same as gcse kid


Because if the enzyme denatures when pH is either side of optimum and pH decreased so the enzyme denatured
Hence why it was constant


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Original post by Hussain96
Because if the enzyme denatures when pH is either side of optimum and pH decreased so the enzyme denatured
Hence why it was constant


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It was triglyceride as the limiting factor in adamant


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Original post by tayyabs17
If you checked the diagram of the mitochondria given in the exam today it showed a piece of circular DNA inside the matrix of the mitochondria, you can also check the structure of mitochondria online and it will show the same Circular DNA, however i think your answers are correct too


I put uncoiled / free floating DNA


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Original post by CourtlyCanter
You had to burst his bubble.


The water causes the decline in PH coz of hydrogen ion concentraion change.
Original post by gcsekid
The water causes the decline in PH coz of hydrogen ion concentraion change.


You're over complicating it, the lactase hydrolysed triglycerides into fatty acids and glycerol hence the decrease in pH


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Original post by Bennyab
You're over complicating it, the lipase hydrolysed triglycerides into fatty acids and glycerol hence the decrease in pH


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Original post by Studious_Student
I just put not to eat dairy products, would that be sufficient for the marks?



I think so. I put no milk products.
Original post by Bennyab
I put uncoiled / free floating DNA


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Thats like the same thing, Should definately be right
Marks for full ums?
Original post by fugeefari
Marks for full ums?


I think it'll be 49 for an A, 58+ for full
Do you think they'd accept the word plasmid instead of circular DNA?
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Original post by Oooooooa
Do you think they'd accept the word plasmid instead of circular DNA?



Yes it is correct
(edited 7 years ago)
Would they accept circular chromosome?


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Original post by Oooooooa
Do you think they'd accept the word plasmid instead of circular DNA?


im sure plasmid is circular dna so you should be fine with it

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