OCR F211/F212 AS Biology Retake 2016

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Reply 340

Nizma

Hi guys, what do think the grade boundries will be like this year? And any predictions for f212?

Thanks

Reply 341

President J

Original post by WillMac53

I put that aswell. Seemed like the most reasonable idea. Flat line at the bottom seems weird to have such a thin right ventricle

They were making the difference in the thickness of the ventricle walls clear.

Reply 342

President J

RE stem cell question. I'm sure normal cells undergo mitosis? I wrote that stem cells have no function. Also, stem calls can rapidly divided.

Reply 343

fizzyalfie

i got FADE, muscles constrict the airways, I know muscular due to high pressure makes sense but the muscles are more to do with constriction. Collagen is more for resistance to high pressure

Reply 344

DeclanKeeble

Original post by badhand45

Hey guys, in regard to the one about water movement everyone put exocytosis but I put osmosis as it is still removal of water, so I checked about the contractile vacuole properties I came across this which states mitosis. do you think they will accept osmosis and exocytosis or be OCR picky? thanks :smile:

Contractile Vacuole:

"The contractile vacuole is basically a water bubble within the endoplasm of A. proteus. It’s function is to regulate the water content of the cell. It is also a means of excreeting its waste from the cell (out through the cell membrane) VIA diffusion. A. proteus regularly moves to the surface of the water, when it needs to discharge wastes and excess water. This is done via osmosis, where there is a semi permeable membrane that lets the flow of materials through the cell. Without the contractile vacuole, the amoeba may burst. Undoubtedly it is a very important organelle with an essential function to the amoeba."

Ooo...that's a good question...if it's scientifically sound then OCR may have to award the mark or if the majority of students write osmosis for example due to reading their wording differently...but they may have wanted you to read further into inbetween what they said and put exocytosis....but you could possibly have "pinoexocytosis" too!

It's a tricky one because like you say, the process of osmosis is occurring... I just saw "fuses with membrane" and thought oh, maybe I should put exocytosis instead, if it's trying to trick me.

Hopefully the biology gods looking down will accept: exocytosis, osmosis or pinoexocytosis :smile:

*goes to a quiet corner and prays*

(edited 7 years ago)

Reply 345

LB9213

Hey guys, Does anyone remember all the options given for the question to do with matching the hearts components with their main functions?

Reply 346

gracamole

Feeling less confident now ive read through this, definitely messed up on the question about moss.

Are we reckoning the grade boundaries will be lower than last years or about the same? :frown:

Reply 347

yusraa_96

For the stem cell question, I wrote that stem cells can become specialised so that they can control their Organelle composition and composition of their membranes.

for the water moving out of cell one, I wrote pinoexocytosis instead of exopinocytosis :frown:

will they still give me the mark for it??

Reply 348

Hsn_

Am I the only who wrote 'stems are able to differentiate and that they are totipotent' ?

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Reply 349

badhand45

Original post by Hsn_

Am I the only who wrote 'stems are able to differentiate and that they are totipotent' ?

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Wasn't that in question "stem cells are able to specialise into other cells"
Isn't differentiation and specialisation the same thing?

Reply 350

GLL1998

Grade boundaries have never been higher than 45/60 for an A, I think this year will be 44/45 for an A as overall the paper wasn't difficult

Reply 351

DeclanKeeble

Original post by LB9213

Hey guys, Does anyone remember all the options given for the question to do with matching the hearts components with their main functions?

Can't quite remember, but it was something like this, in no particular order:

Option C (given in question)

- both the atria pump blood into the ventricles

- the smooth muscle contracts

- the pressure in the blood is high

- the pressure in the blood fluctuates

- the heart has a double circulatory system

- one more option ??

----------------------------------------------------------------------------------------------------
- left ventricle wall thicker than right ventricle wall (given in question)

- the atrial walls are thinner than the ventricles

- the arterial walls have smooth muscle

- small arteries have elastic tissue

- the septum separates the ventricle

Reply 352

Anymorefor123

Original post by DeclanKeeble

Which ones go with which ?

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Reply 353

DeclanKeeble

Original post by Anymorefor123

Which ones go with which ?

Posted from TSR Mobile

I think I messed it up, but it was something along the lines off:

1) the atrial walls are thinner than the ventricles
= both the atria pump blood into the ventricles

2) the arterial walls have smooth muscle
= the smooth muscle contracts

3) small arteries have elastic tissue
= the pressure in the blood is high

I was debating between putting the above^ or "the pressure in the blood fluctuates" but it seems like most people but the latter

4) the septum separates the ventricle
= the heart has a double circulatory system

Reply 354

douglaswill

i though the kLM bit could of been the sinoatrial , atrioventricular and apex... maybe.

Reply 355

FemaleBo55

How ready is everyone for F212?? Im no where near ready LOL -.-

Reply 356

LB9213

Original post by Anymorefor123

Which ones go with which ?

Posted from TSR Mobile

Pretty sure there was also one saying;
In arteries muscle contract to maintain high blood pressure

Reply 357

Jakeycakes

For the vascular bundle question, I wrote that not having these bundles would mean that there would be no cambium so there isn’t as many meristematic cells that could differentiate into specialised cells which would contribute to the growth, decreasing the growth all together but I’ve realised that you’re able to find meristematic cells in the apex of the root/shoot ahhhh idkidkidk lost stupid marks everywhere :frown:

Reply 358