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OCR Biology F212 Revision [3rd June 2013] (Now Closed)

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doods

is outlining the process of atherosclerosis on the spec?

if it is it seems like its something they might ask tbh

Yeah i think you need to know how an atheroma forms, it won't be worth many marks if it does come up though. All you can really say is damage in the artery walls means that a LDL's collect, causing a blood clot to form as the RBC's stick together narrowing the width of the lumen.

Reply 1201

ssflcb

Is it likely that a testing enzyme ability will come up ie the ph or temperature ? or something . . I hate those :s-smilie:

Reply 1202

Hello...

Original post by samiwami

Yep that's right :smile:

)

What has been your method of revision?

Just lots of past papers and using the specification to make notes, i find using that really helps you to make sure you don't miss anything out of your revision and i apologise i forgot to ask a question
What are the effects of Carbon monoxide on the body

Reply 1203

HeyMickey6

GOOD LUCK EVERYONE ! :bumps:

Reply 1204

Hello...

Original post by ssflcb

Is it likely that a testing enzyme ability will come up ie the ph or temperature ? or something . . I hate those :s-smilie:

I think there has been like a 7 mark question on that in 2009 and maybe in jan 2013 as well so may be a bit unlikely to come up

Reply 1205

Majeue

Original post by Hello...

Reduces oxygen carrying capacity of red blood cells as it irreversibly binds to haemoglobin

Reply 1206

samiwami

Original post by Kits

doods

is outlining the process of atherosclerosis on the spec?

if it is it seems like its something they might ask tbh

Yes I think it is

Artherosclerosis is a cardiovascular disease
Caused by the narrowing of the arteries due to a build up of cholestrol or fatty substances which restricts blood flow causing hypertension and artheroma
This happens when nicotine levels rise and platelets form causing a build up
Carbon monoxide damage the inner lining of the arteries which encourages the growth of smooth muscle and fatty substances

I hope this question doesn't come up lol

Reply 1207

ssflcb

exact definition of endangered species ?

Reply 1208

Rick_095

I've been revising simply from the CGP revision guide, but I've noticed that the official Heinemann textbook has quite a bit more detail. Is everything I need to know covered in the CGP guide, or should I get started on the Heinemann textbook?

Reply 1209

Hello...

Original post by Majeue

Reduces oxygen carrying capacity of red blood cells as it irreversibly binds to haemoglobin

Yes, it also combines more readily with haemoglobin than oxygen does, the body will detect a lower amount of oxygen which may increase the heart rate... it can also damage the endothelium of the arteries

Reply 1210

SheriB

Original post by Juliajuliajulia

Have you done all the past papers? If yes I'd say circle the bits you found particularly difficult and write some last minute flash cards of longer answers (basically learn the markscheme for a few) because knowing how to answer then could bag you 12 ish marks in the paper assuming there's a couple of long ones. If no look at the mark schemes for the long ones.

Alsooo I always go over the specification the night before highlighting annoying I don't want there to be a question on and then looking over it- finding any q's in the past. Papers.

Lol dunno if it will pay off!

Anyway:
STARCH is a storage polysaccharide in plants. It's made up of AMYLOSE and AMYLOPECTIN. It's insoluble so does not affect the water potential of a cell and forms granules.

AMYLOSE is made up of alpha glucose. It forms a helical structure. It is a straight chained molecule of 1-6 glycosidic bonds. It is insoluble.

AMYLOPECTIN is also made up of alpha glucose. But it is a branched molecule, with 1-6 glycosidic bonds and 1-4 glycosidic bonds. Apparently it's soluble- according to Wikipedia and also apparently it's 70% of starch so I'm not really sure why starch is insoluble all together, but hey I'm just gonna accept it- anyone?

GLYCOGEN is the animal equivalent of starch- store of glucose. Similar molecule to amylopectin it is a highly branched alpha glucose polysaccharide with 1-6 and 1-4 glycosidic bonds. When talking about function remember its insoluble, doesn't affect water potential of cell and glucose monomers can easily be broken off by hydrolysis reactions and respired to release energy. Also it's a dense energy store.
X

HUH? i thought amylose is made up of 1-4 gycosidic bonds? *pulls at hair* I'm so not prepared

Reply 1211

ssflcb

Original post by Rick_095

I am scared now , i have used cgp too :s-smilie:

Reply 1212

samiwami

Original post by Hello...

Same I did all of the past papers and the spec notes! But the content is so large I feel like I don't know enough :/

lol it's okay

Carbon monoxide combines with heamoglobin to form carboxyheamoglobin which disallows there to be enough oxygen for the cardiac muscle causing a heart attack.
It also means that their heart rate will rise and they feel more fatigue

CO damages the lining of the arteries which makes it more difficult to breath as the smooth muscle is enlarged and this encourages there to be fatty deposits on the arteries - narrower lumen - artheroma

You don't have to ask me a question after this one...I think it's time I call it a day :smile:

Here's yours though,

How does speciation occur?

Reply 1213

sharifma

some help on the immune response please
i`m confused with action of T and B lymphocytes

Reply 1214

Majeue

Original post by ssflcb

I am scared now , i have used cgp too :s-smilie:

Same, i used CGP and my text book, don't worry i'm pretty sure almost everything is covered in CGP, but maybe not always to the amount of detail needed