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Edexcel 6BIO1 ~ 21th May 2013 ~ AS Biology

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Reply 180

Tha Realest

Original post by lob.dub

the most difficult part i find in biology unit 1 is time management.. :frown:

can anyone puleez share some tips on how???

To be honest everyone works at their own pace ; but stick to 1 min per Mark and that will leave you with 10 mins spare at the end to check.

Good Luck : I hope we both get excellent results :biggrin:

Reply 181

amber109

when the markscheme says that correct manipulation gets a mark, what does it mean?

Reply 182

examss

do we have to know the primary secondary tertiary and quartenary proteins in detail?

Reply 183

examss

Original post by amber109

when the markscheme says that correct manipulation gets a mark, what does it mean?

manipulation of figures

Reply 184

TheAsian

Original post by amber109

when the markscheme says that correct manipulation gets a mark, what does it mean?

"Overall, X decreases, E.g, at 20 mins it was at 10cm, but at 30 mins, it was at 5cm"

Using the data to prove your point.

Reply 185

TheAsian

Can someone bullet point ALL the core practicals, in say 6 points, as it would appear in the mark scheme please? :colondollar:

THANK YOU.

Reply 186

daniya12

Original post by TheAsian

"Overall, X decreases, E.g, at 20 mins it was at 10cm, but at 30 mins, it was at 5cm"

Using the data to prove your point.

That's just stating, data manipulation involves a calculation with the data, so instead of quoting the data, you would say that in 10 minutes, X deceased by 5 cm

Reply 187

amber109

Original post by TheAsian

"Overall, X decreases, E.g, at 20 mins it was at 10cm, but at 30 mins, it was at 5cm"

Using the data to prove your point.

Ahh okey Thanks!

Reply 188

TheAsian

Original post by daniya12

That's just stating, data manipulation involves a calculation with the data, so instead of quoting the data, you would say that in 10 minutes, X deceased by 5 cm

OOOOOOOOOH okay thanks.
Wow, I went the whole year not even knowing that. :confused:

Reply 189

daniya12

Original post by amber109

when the markscheme says that correct manipulation gets a mark, what does it mean?

It means manipulate the figures; so do a calculation with them. Instead of stating that X increases/ decreases from this value to that value, you would say that X increases/decreases by this value, so you have to do a calculation to find that value.

Does that make sense? :smile:

Reply 190

amber109

Original post by daniya12

yeah that makes sense! so basically do a calcualtion along with stating what data you see, thanks!

Reply 191

shareen96

sooo scaredd afterr my terrible examm yesterday! have a feelings it gonna be proper hard-.-

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Reply 192

rockstar101

Original post by shareen96

sooo scaredd afterr my terrible examm yesterday! have a feelings it gonna be proper hard-.-

Posted from TSR Mobile

omg i so totally know how u feel. Although physics is always a pain. I love bio im just praying my love gets me through ive studied everything so god knows now.

Reply 193

examss

do we have to know the primary secondary tertiary and quartenary proteins in detail?

Reply 194

Sravya

Original post by Abigail05

unfortunately she is so annoying and against telling us anything :frown:

she even said that she could remember one of the questions but wouldnt tell us, even though we were begging her!!

if it's any hint at all, in her revision lessons with us shes done
-cystic fibrosis (cause, treatment, effects, testing)
-the heart structure and atherosclerosis
-structure of amino acids
-transcription/translation
-mono/di/polysaccharides
-water

shes not done the fluid mosaic model..... or the titration practical.... so maybe theyre not in it?

that's all i can remember, but from what she said today it's going to be an absolutely hideous paper

Well that bodes well... 4th time sitting it i need a NICE paper!

Reply 195

username1060297

Is the semi conservative theory basically just taking a strand of DNA from each parent? :/

Reply 196

Sravya

Original post by examss

do we have to know the primary secondary tertiary and quartenary proteins in detail?

this is the detail I know it in :smile:

Primary Structure:
Sequence of amino acids joined by peptide bonds
Secondary Structure
The p[peptide chain coils into alpha helix's or beta sheets and they are joined by hydrogen bonds
Tertiary Structure
These are usually globular and the folded chain of amino acids is coiled further or folded further, You will get Ionic bonds and disulphide bridges

Quaternary structure:
There are the way the polypeptide chains are assembled together and it is the final 3D structure. It is also dependant on the tertiary structure so it is influenced by all the above bonds

The primary structure determines the final 3D structure as it depends on the sequence of amino acids which then determine the positioning of the bonds which then determines the shape of the active site

There are 2 types of 3D structure:
Fibirus:
There are long insoluble proteins which are tightly coiled in a rope shape. They have lots of bonds so are hard to break. you usually find them in supportive tissues such as muscles

Globular:
They are round and compact. They are coiled so that the hydrophilic part face inwards. This makes it soluble so they are easily transported in fluids. Examples could be haemoglobin

Reply 197

mynameisntbobk

Original post by Ki Yung Na

Is the semi conservative theory basically just taking a strand of DNA from each parent? :/

Not quite. Strands from parents seperate, and free floating mononucleotides join up at completementary bases on the strands. (It's the currently accepted theory)

Good luck to everyone for today! Hope the paper goes well for you all!