OCR AS Biology (F211) - Jan 2013.

To be honest I have a feeling the paper will be similar to Jan 2012 lots of application questions but just remember that these application you know the answers but they make the text more confusing.

Thanks! I'm just wondering if the heart will actually come up this time...
including the application questions. Eg. The heart, lymphs, tissue fluid, cell organelles etc.

Reply 1581

otrivine

14

Original post by Shotokeke

Thanks! I'm just wondering if the heart will actually come up this time...
including the application questions. Eg. The heart, lymphs, tissue fluid, cell organelles etc.

yes i think the heart and plants will be there.

Reply 1582

shaniieexo

8

Original post by coolheadjody

Do you need to know how tissue fluid is formed from blood, or is it just for plasma.

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you need to know how its formed from hydrostatic pressure :smile:

Reply 1583

Bullet Knuckle

14

Original post by sandra95.p

90 UMS is the maximum mark. http://www.ocr.org.uk/images/15887-unit-level-raw-mark-grade-boundaries-june-2010.pdf scroll down to Biology :smile:

thank you for the grade boudaries ... lm kinda too calm about tommorow ...

Reply 1584

morvenrkr

Any tips/key points/help on these things would be so greatly appreciated

(j) explain the mechanism by which water is transported from the root cortex to the air surrounding the leaves with reference to adhesion cohesion and the transpiration stream

(m) describe the mechanism of transport in the phloem involving active loading at the source and removal at the sink

Please please help me :'(

Reply 1585

Bullet Knuckle

14

Original post by xT4Z1N4TRx

we've learned mitosis yeah, prophase metaphase anaphase telophase and we've done cytokinesis, we were told what happens in interphase but never specifically told anything about G phases :confused:

Dont worry just know this :
G1 - 1st where protein synthesis happens in preparation for mitosis
and
G2 - growth of organelle

S phase - Where DNA replication takes place

hope this helps you tommorow

Reply 1586

safian

Can someone explain to me what the Bohr effect is, and if they ask us to interpret a graph in the exam, what details would we need to include.

Reply 1587

Shotokeke

Original post by otrivine

yes i think the heart and plants will be there.

Thanks again. I hope everyone does well, and the exam is easier LOL

Reply 1588

izzo

Hello everyone, I was wondering if anyone has managed to get hold of the OCR F211 MAY 2012 paper as I've been trolling around the internet and cant find it anywhere? If anyone can post it that would be grateful it is not an official one released by OCR but people who have already taken the paper might have a copy of it....

Reply 1589

lfmox

9

Good luck everybody! Me and some friends are sitting this tomorrow and we're all absolutely bricking it - our first EVER A level exam!

I'm starting to worry now because I'm sitting here unsure of what to do. So instead of me panicing and trying to decode the textbook, could anyone just help me out with a few things?

(Feel free to add me on skype - lfmox3)

CMs to UM (micrometers) - x10 000

Inspiration:

•

Diaphragm goes down, squashes digestive organs

•

Intercostal muscles contract and push the ribs up and out

•

Pressure in lungs drops below atmospheric pressure

•

Air is moved into the lungs

Expiration:

•

Diaphragm goes up, digestive organs return to original size

•

Intercostal muscles relax and the ribs go down and in

•

Pressure in the lungs rises above atmospheric pressure

•

Air is moved out of the lungs

Anyone mind letting me know if that is right? ^

& Could anyone also explain tissue fluid, lymph and how the fluid returns to the blood?

Not sure if there's anything missing - I'm happy to try and answer any questions!

I'm aiming for a B. Originally an A but I discovered that actually, I really enjoy my essay subjects and I'd rather drop this subject before A2. Thanks in advance!

Reply 1590

morvenrkr

Original post by izzo

Hello everyone, I was wondering if anyone has managed to get hold of the OCR F211 MAY 2012 paper as I've been trolling around the internet and cant find it anywhere? If anyone can post it that would be grateful it is not an official one released by OCR but people who have already taken the paper might have a copy of it....

May 2012 Paper.pdf
June 2012.pdf

June 2012.pdf253.0KB

May 2012 Paper.pdf188.2KB

Reply 1591

joe1545

14

Describe the transpiration stream (3+1)

Reply 1592

izzo

Original post by safian

Can someone explain to me what the Bohr effect is, and if they ask us to interpret a graph in the exam, what details would we need to include.

The Bohr shift is a **** to the right of the original curve when looking at a diagram it is the shift to the right of the curve this is in the presence of increased amount of carbon dioxide, so when you get this question you just state that haemoglobin releases oxygen more quickly in to respiring tissues due to the presence of co2/h+ ions

Reply 1593

lzbthx

Original post by Farhat16

thankyouu! :biggrin:

do we have to know how they are specialised?

"define the term differentiation, with reference to the production of erythrocytes and neutrophils derived from stem cells in bone marrow"

and

"describe and explain, with the aid of diagrams and photographs, how cells of multicellular organisms are specialised for particular functions, with reference to erythrocytes; neutrophils, epithelial cells, sperm cells, palisade cells, root hair cells and guard cells"

I think the most they expect you to know about them is that they contain lysosomes which contain digestive enzymes. When phagocytes ingest the pathogen, it is taken in in a vesicle and the vesicle is then transported to a lysosome where the lysosome and vesicle fuse and the digestive enzymes break down the pathogen in the ingested vesicle.

Please correct me if I'm wrong! But I wouldn't worry about it too much :smile:

in the past papers I've done they usually give you a diagram and you can point out things like mitochondria and say they are many of them so a lot of ATP can be generated

Reply 1594

izzo

Original post by morvenrkr

May 2012 Paper.pdf
June 2012.pdf

Thank you sooooooooooooooooooooo MUCH!!!!!

Reply 1595

shaniieexo

8

Original post by izzo

The Bohr shift is a **** to the right of the original curve when looking at a diagram it is the shift to the right of the curve this is in the presence of increased amount of carbon dioxide, so when you get this question you just state that haemoglobin releases oxygen more quickly in to respiring tissues due to the presence of co2/h+ ions

Does it release oxygen more quickly? - I always thought it just offloaded more oxyhaemoglobin.

Reply 1596

priya8D

9

Original post by lfmox

Good luck everybody! Me and some friends are sitting this tomorrow and we're all absolutely bricking it - our first EVER A level exam!

I'm starting to worry now because I'm sitting here unsure of what to do. So instead of me panicing and trying to decode the textbook, could anyone just help me out with a few things?

(Feel free to add me on skype - lfmox3)

CMs to UM (micrometers) - x10 000

Inspiration:

•

Diaphragm goes down, squashes digestive organs

•

Intercostal muscles contract and push the ribs up and out

•

Pressure in lungs drops below atmospheric pressure

•

Air is moved into the lungs

Expiration:

•

Diaphragm goes up, digestive organs return to original size

•

Intercostal muscles relax and the ribs go down and in

•

Pressure in the lungs rises above atmospheric pressure

•

Air is moved out of the lungs

Anyone mind letting me know if that is right? ^

& Could anyone also explain tissue fluid, lymph and how the fluid returns to the blood?

Not sure if there's anything missing - I'm happy to try and answer any questions!

I'm aiming for a B. Originally an A but I discovered that actually, I really enjoy my essay subjects and I'd rather drop this subject before A2. Thanks in advance!

Inspiration and Expiration is fine :smile:

Isn't cm-micrometers x1000?
Someone already explained tissue fluid a page back or so. The tissue fluid is drained into the lymphatic system, which contains vessels similar to capillaries, that eventually rejoins the blood system in the chest cavity :smile:

Reply 1597

Sam_1996

Are capillary action and adhesion the same thing?
Is transpiration pull the same as tension/cohesion?

Reply 1598

notsure

11

APPARENTLY A QUESTION ON ECG TRACES MIGHT COME UP (maybe!) BECAUSE THEY HAVEN'T EVER ASKED A QUESTION ON IT ON THE NEW SYLLABUS (since 2008) AND ITS STILL ON THE SPEC (so I'd advise to just go over it incase if you haven't :biggrin:

) good luck everyone and don't panic :smile:

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