AQA BIOL1 ~ 14 May 2012 ~ AS Biology

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BubbleGum25
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#1
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#1
:bubbles: Just thought i'd make a thread for anyone who needs help
only a month left now
i've revised everything but havent yet dun any past papers.
i've attached some past papers if anyone needs them
:borat: gud luck everyone
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BubbleGum25
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#2
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#2
Im quite unsure of immunology :confused:
so can someone please explain the ethics of vaccines and monoclonal antibodies
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singingmermaid
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#3
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(Original post by BubbleGum25)
:bubbles: Just thought i'd make a thread for anyone who needs help
only a month left now
i've revised everything but havent yet dun any past papers.
i've attached some past papers if anyone needs them
:borat: gud luck everyone
yeh time has goen so quickly, so nervous! are u doing resit?
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khimmy
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Ooh thanks a lot for the past paper links
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vVShabbaVv
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resitting. Gonna really watch the time on this one, last time i left almost 2 pages blank :facepalm:
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khimmy
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hey guys by the way do you have any prediction for the likelihood of what might come up?
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Abbers
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#7
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(Original post by khimmy)
hey guys by the way do you have any prediction for the likelihood of what might come up?
Atheroma
non-functional enzyme
enzyme(inhibitions/models)
1/2 lung disease questions
1
tabraiz_
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(Original post by Abbers)
Atheroma
non-functional enzyme
enzyme(inhibitions/models)
1/2 lung disease questions
Do you think that this will be all?
Wont they ask about any tests?
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thescientist17
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This thread is a bit dead! How is everyone feeling? 4 days to go! :O

Does anyone find the Nelson Thornes textbook a bit.. meh? To start with I didn't use my revision guide at all because I thought it wouldn't go into enough detail but there are some key points missing in this textbook! Like for Unit 2 I don't think it mentioned introns anywhere. And there's some other stuff too- like about pulmonary tuberculosis and how smoking decreases the amount of antioxidants in the blood which protect cells from damage.

Past papers are the way forward!
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SafaIqbal
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do you think they'll ask stuff about vaccines and immunology and that stuff?
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SafaIqbal
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#11
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(Original post by thescientist17)
This thread is a bit dead! How is everyone feeling? 4 days to go! :O

Does anyone find the Nelson Thornes textbook a bit.. meh? To start with I didn't use my revision guide at all because I thought it wouldn't go into enough detail but there are some key points missing in this textbook! Like for Unit 2 I don't think it mentioned introns anywhere. And there's some other stuff too- like about pulmonary tuberculosis and how smoking decreases the amount of antioxidants in the blood which protect cells from damage.

Past papers are the way forward!
SERIOUSLY NOT READY :O
i know the stuff but the way its worded, i cant deal with :/
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YazB7
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#12
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#12
(Original post by thescientist17)
This thread is a bit dead! How is everyone feeling? 4 days to go! :O

Does anyone find the Nelson Thornes textbook a bit.. meh? To start with I didn't use my revision guide at all because I thought it wouldn't go into enough detail but there are some key points missing in this textbook! Like for Unit 2 I don't think it mentioned introns anywhere. And there's some other stuff too- like about pulmonary tuberculosis and how smoking decreases the amount of antioxidants in the blood which protect cells from damage.

Past papers are the way forward!
Hi, I didn't think it mentioned introns either! But my teacher found it for me today on page 137 of the nelson thornes textbook. They only touch slightly on it as its mainly an a2 question. I hope this helps. It's the little paragraph above the application info xx
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Jakez123
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#13
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Random Tips for this papers 2/3 Mark questions and how to answer them.

If it asks you a question on how an (competitive) inhibitor slows down an enzyme catalyzed reaction always mention:


  • That the inhibitor has a similar shape to the substrate which is complimentary to the enzyme
  • It occupies the enzymes active site
  • preventing enzyme substrate complexesfrom being formed


Questions stating why an enzyme is specific normally follows this route:


  • Enzyme has a specific tertiary structure
  • Thus a specific active site
  • Which is complimentary to the substrate
  • forming enzyme substrate complexes


Question regarding Antibodies and why they are specific follow this route:



  • it has Specific primary structure thus specific secondary and specific tertiary structure
  • Therefore it has a specific variable region which is complimentary to the antigen
  • forming Antigen-antibody complexes


Questions about what an antigen is always follows this route:



  • It is a protein
  • which triggers immune response



questions regarding emphysema always want you to mention these sort of things when it talks about reducing gas exchange efficiency:



  • Elastin is broken down in alveoli thus they cannot recoil
  • As they cannot recoil low concentrations of oxygen cannot be exhaled
  • thus a lower diffusion gradient
  • smaller surface area
  • therefore a longer diffusion pathway


I'm not saying these are correct but they tend to follow this pattern, there are more that i know of but these are the most common, if there are any errors tell me and sorry for any spelling/grammar mistakes.
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thescientist17
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(Original post by YazB7)
Hi, I didn't think it mentioned introns either! But my teacher found it for me today on page 137 of the nelson thornes textbook. They only touch slightly on it as its mainly an a2 question. I hope this helps. It's the little paragraph above the application info xx
Oh thanks! It's amazing how easily you can look over information.. I guess because they don't really put emphasis on it and it's not in the definitions in the back.

But definitely unit 1 there is some stuff that it doesn't include! Like all the stuff on TB, if you wrote that for an exam answer it's not what they're asking for.
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564767
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B would do me good.
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YazB7
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(Original post by thescientist17)
Oh thanks! It's amazing how easily you can look over information.. I guess because they don't really put emphasis on it and it's not in the definitions in the back.

But definitely unit 1 there is some stuff that it doesn't include! Like all the stuff on TB, if you wrote that for an exam answer it's not what they're asking for.
Tbf I've given up on biology. I'd rather stick pins in my eyes than do a2. Unit 2 exam i'll be happy with an E, that's how bad it is
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ItsAnnaYay
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Hi, can I just ask...
For this exam do you need to know how the microscopes work?
eg. about the electron gun producing a beam?
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swiftylol
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#18
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(Original post by ItsAnnaYay)
Hi, can I just ask...
For this exam do you need to know how the microscopes work?
eg. about the electron gun producing a beam?
Yeah, you do

Edit: misread the thread title lol
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MediterraneanX
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(Original post by SafaIqbal)
do you think they'll ask stuff about vaccines and immunology and that stuff?
yeah they seem to whack that in every year - its always the page I do worst in on the past papers!
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Abbers
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#20
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#20
Can someone explain the lock and key and induced fit model? And how they differ?
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