AQA AS Biology unit 1 25th May 2010 Watch

VULGAR123
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#101
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Are you guys attempting the paper for the first time or is it a retake? We got taught both units together and they linked topics with similar unit 2 topics; highly confusing and very inconveniant.
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Trytostaypositive
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(Original post by blank_blank)
DOES ANYONE HAVE THE PAST PAPER AND MARK SCHEME FOR JANUARY 2010 BIOLOGY MODULE 1??!!

it would be quite good to see it cz i thought i had done quite well :/
I have them:
Jan 2010 BIOL1 QP.pdf

Jan 2010 BIOL1 MS.pdf

Oh and good luck everyone!!!

I thought i had done well until i got a D (1 from a C)
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Cthumbalina
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#103
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I have got to go over The heart..and then that'll be my revision done..the last time I sat this exam was Jan 2009. Lord help me.
I'm counting on the fact I' a year & a half smarter now to help me get an A!
Would reallyyyyyyyyyyyyyyyyyyy boost my A2 lol
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Cthumbalina
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I have got to go over The heart..and then that'll be my revision done..the last time I sat this exam was Jan 2009. Lord help me.
I'm counting on the fact I' a year & a half smarter now to help me get an A!
Would reallyyyyyyyyyyyyyyyyyyy boost my A2 lol
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Cthumbalina
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#105
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ahhh omg excuse the multiple posts, its my computer spazzing up!
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VULGAR123
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(Original post by Cthumbalina)
I have got to go over The heart..and then that'll be my revision done..the last time I sat this exam was Jan 2009. Lord help me.
I'm counting on the fact I' a year & a half smarter now to help me get an A!
Would reallyyyyyyyyyyyyyyyyyyy boost my A2 lol
Does it seem easier, now that you've done the harder units?
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T.S
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(Original post by CHEM1STRY)
Cholera is caused by Vibrio Cholerae. It propels itself through the mucus lining the epithelial cells in the intestine in a corkscrew like motion with its flagellum. Here it secretes a toxin in two parts.

One part binds to the glycolipids on the CSM of the epithelial cells. The receptors have a very specific shape and the toxin is only complementary shape to these receptors so only affects epithelial cells. Another part causes the release of cyclic AMP which causes the chloride ion channels to open.

Cl- ions flood out of the cells into the ileum, followed by Na+ ions to neutralise the building potential difference across the CSM. This lowers the water potential in the ileum and raises it in the epithelial cells. Hence water moves out of the epithelial cells via osmosis.

There is now a conc. gradient of ions from surrounding tissues to the epithelial cells, causing them to diffuse from the tissues to the epithelial cells. This raises their water potential so water moves via osmosis from tissues and blood to epithelial cells then into the ileum, causing dehydration and diarrohea.
thanks for tht!
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Cthumbalina
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(Original post by VULGAR123)
Does it seem easier, now that you've done the harder units?

Oh yeah definitely, even though they aren't greatly related, the content is so much easier to digest.

Unit 4 resit & Unit 5 in June will be my doom.
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INeedToRevise
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Is this description sufficient for cell mediated and humoral responses:

Cell mediated:

-Uses T cells which attach to foreign antigens or trigger humoral response
-Killer T cells secrete substances to kill pathogens
-Helper T cells help plasma cells produced by B-lymphocytes to secrete antibodies
-Memory T cells recognise the antigen in the future. The immune system responds quickly to future attack
-Supressor T cells- slows down the activity of killer T cells and B cells when antigens have been destroyed.

Humoral Response:

-B cells release antibodies.
-When a B cell meets with an antigen, the antigen bind to the antibodies's receptor site.
-This stimulates B cells to release antibodies.
-The B cell divides to form clones called plasma cells.
-They release antibodies.
-Some clones become memory B cells.

And what are macrophages?
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greatmonte
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#110
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I got an A in it last year but I did badly in this years ISAs so I need to claw back extra marks so im ressiting it.........I hate exams
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username380364
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(Original post by Trytostaypositive)
I have them:
Jan 2010 BIOL1 QP.pdf

Jan 2010 BIOL1 MS.pdf

Oh and good luck everyone!!!

I thought i had done well until i got a D (1 from a C)
When you do practise papers how do you know what grade you are getting? They dnt show grade boundaries like ocr does. I just got 45/60 in this paper but i dnt know whether I should call that an A or B.
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LettersFromTheSky
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#112
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#112
(Original post by Scrubby)
Nah I just checked and it's the last question for the June 09 paper
oooh. hmm it could still come up in another form. Though thanks for providing the mark scheme answer.
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LettersFromTheSky
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(Original post by I_Need_To_Revise)
Is this description sufficient for cell mediated and humoral responses:

Cell mediated:

-Uses T cells which attach to foreign antigens or trigger humoral response
-Killer T cells secrete substances to kill pathogens
-Helper T cells help plasma cells produced by B-lymphocytes to secrete antibodies
-Memory T cells recognise the antigen in the future. The immune system responds quickly to future attack
-Supressor T cells- slows down the activity of killer T cells and B cells when antigens have been destroyed.

Humoral Response:

-B cells release antibodies.
-When a B cell meets with an antigen, the antigen bind to the antibodies's receptor site.
-This stimulates B cells to release antibodies.
-The B cell divides to form clones called plasma cells.
-They release antibodies.
-Some clones become memory B cells.

And what are macrophages?

Good answer. Taken from one of the revison guides I have:

The humoral response and cell mediated response both depend on initial recognition process by white blood cells called macrophages. So they recognize foreign antigens? I think.
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INeedToRevise
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#114
What is the function of:

-SER
-RER
-Golgi body
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student53
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#115
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#115
AHHHHH is tomorrow!!!
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LettersFromTheSky
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#116
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(Original post by I_Need_To_Revise)
What is the function of:

-SER
-RER
-Golgi body
ser- synthesis of lipids, detoxification
rer- transport system in cytoplasm, collects, stores and packages and transports the proteins made on the ribosomes
golgi body-modifies chemicals before secretion from cell. Forms lysosomes.
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INeedToRevise
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Markscheme:
Protein synthesis requires energy / ATP;
Mitochondria release energy / make ATP;
From respiration;

Do not award credit for second point if candidate refers to
mitochondria making / producing energy


So yeah: mitochondria RELEASE energy but PRODUCE ATP.
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merle123
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#118
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#118
bio exams are hard because the markscheme is so 'particular' to put it politely
they only look for one word/short phrases, but i just never seem to be able to see what theyr looking for!!!!
ugh..... tomorows gunna be tough
although on a positive note, a reflection of how hard the bio exams are is in the grade boundaries.
last year it was about 50% for an A, for both papers!"!!!! there is still hope left!!!!
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Trytostaypositive
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(Original post by jennaz77)
When you do practise papers how do you know what grade you are getting? They dnt show grade boundaries like ocr does. I just got 45/60 in this paper but i dnt know whether I should call that an A or B.
A definitely:

Grade Boundaries are on the AQA website.

I don't think it has ever been above 40/60 for an A

Jan 2009 was 37/60
June 2009 was 40/60

Not sure about Jan 2010 but it will be on AQA website somewhere
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Lee :D
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A definitely:

Grade Boundaries are on the AQA website.

I don't think it has ever been above 40/60 for an A

Jan 2009 was 37/60
June 2009 was 40/60
Really

I thought it was generally around 80% for an A, 70 a B, 60 a C, etc
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