OCR Biology F215 Control, Genomes and Environment Fri 15 June 2012

Is transpiration not the water loss of from the aerial parts of the plants? So if the stomata is closed, it would reduce the amount of water lost. So the plant would wilt if the rate of transpiration exceeds the rate of water uptake?

That is correct, could add it is an amino acid derivative so cant pass through the phospholipid bilayer because it is not fat soluble.

Thats correct . The function of mineralocorticoids is to control salt and water balances and the function of glucocorticoids is to control fat, carbohydrate and protein metabolism.

How accurate does our naming of the 'bands' have to be? Because in one of my textbooks, the H band is called the H zone and in another it's called the H band?

Yup. I'm retaking. I got a C. Few marks off a B. Wish I didn't bother :/ How's your F214 going?

Apoptosis. Programmed cell death.
The cell releases particular chemicals that breaks down the interior organelles and substances inside the cells' nucleus and the cell itself. The cell then shrinks and as it continues to break down, it is engulfed by phagocytes.

..I actually don't know the answer. :/ Well. I can't remember all.

Sorry late reply..fell asleep lol
Your answer is pretty decent. The first part defining apoptosis is good, and yu did mention that the cell breaks down, but I think a few keys words will lose you a few marks ...you know what the mark scheme is like XD!

Heres a more key wordy kinda answer
Apoptosis, higly controlled programme cell death. Cell releases internal enzymes that begins to break the cytoskeleton into bits, then the cell itself begins to form small fragments called blebs. Then it further broken down into vesicles are taken up my phagocytosis so that it does not damage neigbouring cells. The whole process happens quickly.



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hi mate shall we continue you start

Helloo yup give me 10mins im munching my breakfast :d

And what chapter would you like it on? Still up to immobilised enzynes, or have you gotten further?

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still upto immobilised finishing the rest tomorrow
and as well for unit 4 from chapter 1 and some from chapter 2(first four pages)
and enjoy your breakfast what are you having?

Ooh okay, finished my breakfast now, had coco pops mixed with rice crispies..im such a kid LOL.

Questionn time.. um

What are the advantages (3) and disadvantages (1) of asexual reproduction?



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oh i have that i have toast with nutella and nesquick loooool
ok
3 advantages- has same genetic information which enables to give a specific characterisitc, reproduction can still continue even if sexual reproduction fails, it is much quicker
disadavatage is that there is no/little genetic variation

Nice nice, 3/4 one mark lost because the first advantage you mentioned is not right. The other advantage is that all offsprings has the genetic information required to survive in that environment. But other than that welll done

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yes that is what i meant? has same genetic information has a specific feature which enables it to survive? or did i lose a mark cause i did not say survive?

Ohh sorry, looking back at your answer I see what you meant, but I still would say you lost that mark because you did not mention survival

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Nice nice, 3/4 one mark lost because the first advantage you mentioned is not right. The other advantage is that all offsprings has the genetic information required to survive in that environment. But other than that welll done

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snap
ok
Ill give you 1 question then are you here in 2 hours time?

ok
state 2 reasons why DNA probes are used(2)

Yupp I will be. DNA probes? Ahh umm, im not too sure but.. DNA probes are attached with markers to identify certain DNA sequences. For disease or a gene needed for genetic engineering?

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Can someone tell me the meaning of allopatric please?

Thanks in advance!

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I AM BACK yes close u get one mark for the engineering part and say helps to identify the allele missing which causes the disease

Oohh okay thanks ! Am suprised i even got that one mark, complete guess!

Okay okay your turn!

Define monophyletic.

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does allopatric mean the geographical separation of two individuals prevents them from interbreeding and is a reproductive barrier