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AQA AS Unit 1 Biology Exam 21st May 2015

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Original post by SamuelSingleton
my college starts this exam tomorrow at 2...

one stands corrected :biggrin:
Original post by Malicious
What's the biuret test?

Add something then turns violet?


biuret test is the test for proteins
Basically you can say add naoh to copper (II) sulphate which gives a purple correlation.

OR you can just say add biuret: purple=protein is present
blue= protein not present
Original post by nishofficial
Apart from alpha glucose and an amino acid is there any biochemistry we have to remember to be able to draw?



Triglyceride
Original post by Supermanxxxxxx
Antibody and antigen defenition


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Original post by Supermanxxxxxx
Antibody and antigen defenition


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Antigen - Protein which triggers an immune response.

Antibody - Protein produced by plasma cells
What does it mean when it describes systole and diastole in the heart ?
Original post by edward090
why do u have ur exam so early or this just banta?


just banter dw :tongue: i think i'd be dead if i had to wake up at 5am to go to a 5:30am exam haha!
Original post by Malicious
WHAT?! Isn't reducing sugar test add benedicts, heat, brown/orange coloration?! Sorry i'm panicking xD




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Yes.But that guy went into too much detail.Benedicts reagent contains copper sulfate and naoh, but to don't have to know that.But that's what actually causes the colour change.
Original post by buckeybarnes
antibody is a protein produced by b and t lymphocytes which binds to antigens it has a complimentary active site to and destroys them

antigens are proteins on the surface of a pathogen or foreign/non-self object that cause an immune response in the body/ the production of antibodies

they kinda intertwine :smile: good luck in ur exam


T lymphocytes don't directly produce antibodies huni! It's only B cells that form plasma cells which directly secrete antibodies.


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Original post by samwillettsxxx
Triglyceride


image.jpg
Original post by nishofficial
Apart from alpha glucose and an amino acid is there any biochemistry we have to remember to be able to draw?


beta glucose could be useful that is just where the h and oh on the carbon furthest to the right are swapped around, and name the groups in amino acid- carboxyl group -cooh, amino group- nhh, r group and hydrogen atom
Original post by biojames
What does it mean when it describes systole and diastole in the heart ?



Systole is contraction and diastole is relaxation
Don't worry just different words for them :smile:
Original post by biojames
What does it mean when it describes systole and diastole in the heart ?




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Systole means contract, Diastole means relax.
Original post by awesomewarsome
T lymphocytes don't directly produce antibodies huni! It's only B cells that form plasma cells which directly secrete antibodies.


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oops sorry my mistake thank you :smile:
Original post by AleenaDina8
ive learnt fructose and galactose aswell and beta glucose

learnt fatty acids and glycerol aswell


You don't even need to know beta glucose, it's not on the Aqa spec


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Original post by Setarehp
biuret test is the test for proteins
Basically you can say add naoh to copper (II) sulphate which gives a purple correlation.

OR you can just say add biuret: purple=protein is present
blue= protein not present




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Nvm.what I said,I'm wrong.
(edited 8 years ago)
Original post by Kadak
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No,the t cell is attached to the antigen presented by the phagocyte, but the antibody does immobilise the pathogen.


Ah yes, had a bit of miscommunication there :tongue:
Want to wish everyone the best for the exam tomorrow.
Hopefully we'll all do as well as we want/deserve.
Original post by Kadak
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Yes.11 January 2011.


cheers :smile:
Original post by ssn2125
You don't even need to know beta glucose, it's not on the Aqa spec


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you dont need to know it but you will be tested on it in unit 2 biology so whats the harm in knowing it now !!!!! :/ plus it makes sense knowing about it after all you are studying reducing sugars
Original post by Malicious
WHAT?! Isn't reducing sugar test add benedicts, heat, brown/orange coloration?! Sorry i'm panicking xD




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I apologise I'm wrong. You do use copper sulfate and naoh in biuret test.
I'm confused it with iodine test.

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