OCR Biology F211 Exam - Tues 11'th January 2011

s**t! i wrote about trapped air but then i crossed it out and wrote a whole load of nonsense! instead, i wrote about how the bottom part is dead so it cant transport air therefore we cut off the dead part aggh

s**t! i wrote about trapped air but then i crossed it out and wrote a whole load of nonsense! instead, i wrote about how the bottom part is dead so it cant transport air therefore we cut off the dead part aggh

I was not pleased with that paper. It's as if OCR designed the paper to specifically target the weak points in my revision. <_<

xylem elements are always dead though?

Erm, well, it was alright tbh. There were a lot of sneaky/disguised questions, and I just plain didn't know the facts in some. My teacher's predictions were absolute spot on though, she said unlikely to be anything on heart, lymph, or vessels. As well as saying that plant transport would feature heavily (it was 14/60 marks, more than anything else), and telling us exactly the answer to the 'why would you cut the end of the stem off'. I however, didn't know properly the answer to the last part of qu1 (diff between animals and plant cell division - i just scribbled something about meristems and bone marrow or something), and I was slightly unsure on a few others. Hopefully full UMS, but I dunno. Wbu, how did the tutor do ?

also, about the answers, has noone managed to get a copy of the exam paper and post the answers here?

It can't be bronchiole because the alveoli weren't relative in size if it were a bronchiole!

LOL at everyone getting worked up about 2 mark questions.

to all the newbies, welcome to TSR

lol, same here! I concentrated mainly on the heart and lungs and not at all on plants

Soz mate, you've got it wrong. My biology teacher (must be the best in the country, predicted absolutely everything right on the paper, one of the questions word-for-word), said the following;

One mark for plain diffusion/osmosis through the cell membrane, as water molecules are very small. However, the second mark, will be for mentioning channel proteins, as water molecules, however small, are actually charged, and so a channel protein lets through molecules that are charged. Remember that the Phosphate heads are actually hydrophobic, and that there is a chance that a water molecule could hit that and be repelled. As a result, there are channel proteins that open for water molecules to leave.

The apoplast and symplast pathways are irrelevant to the cell surface membrane. They are relevant to how water, taken in at the roots, reaches the xylem cells.

As it happens, I only got the first mark, but think about it, they cannot expect you to explain the apoplastic and symplastic pathways, as well as an explanation of diffusion in two lines and two marks. Even if you somehow managed to fit it in, it is irrelevant because nowhere in the question does it mention that. It mentions cell surface membrane, ie, the plasma membrane, not the symplastic and apoplastic pathways, which go through a number of cells, membranes and plasmodesmata.

Ahh this is such a huge thread, and my PC is realllyyy slow! So I was wondering what everyone answered for the "how transcription helps water movement up the plant" and "neutrophils" questions.

Cheers guys!

magnification 4500x?
Neutrophil question?
alveoli answer was Bronchi wasnt it?

accuracy and reliability question?
for the accuracy i wrote let someone else look at the number of plasmolysed cells.
For the reliabilty i said repeat 3 times and take an average to be able to identify anomolous results

I made up a bunch of rubbish for this question :/

So like, why the hell was there nothing on the heart or anything!? That is so frutrating. I really prepared for that lol.

Anyone else seem to run out of time and go on a mad rush at the end, JUST finishing? (I hope)

OMG thankyou
ur a life saver

gud luck for exam tomorow lol