[n2l]

I wouldn't even dare to imagine that..i don't know much about those hormones!! They're so confusing!! LH stimulates either oestrogen/progesteron which in turn reduces the secretion of another hormone..messy stuff.

I'll probably choose 4B if that really comes up tomorrow..

[Nonloso]

On the thing I posted earlier from edexcel, it says that gene tech and enzymes could potentially be linked together in the essay. That would be restriction endonuclease and DNA ligase, but what else could you include in that?

[n2l]

DNA polymerase. That can be used to amplify the number of genes or something..

Besides, the multiplication of genes involve lots of enzymes too..

[discombob]

Reverse transcriptase to get cDNA off an mRNA strand for eg. rennin (extracted from a calf).
Has come up before in june 07 I think? But not as an essay question.

[Nonloso]

but you could also link in the whole enzyme thing, structure, function, part of metabolic pathways etc, or would that be too much?

[roberto775544]

but 4b would involve knowing about Auxins etc and thats just pain.

[discombob]

(Original post by Nonloso)
but you could also link in the whole enzyme thing, structure, function, part of metabolic pathways etc, or would that be too much?

You could, a bit I suppose. Just for the sake of 'balance', incorporating some Unit 1 stuff in there.

[Braund]

1) Give an account using named examples of the role of enzymes in gene technology.

2) The role of water in the lives of organisms.

3)Human influences on the environment and there effects on biodiversity(think about deforestation, desertification, acid rain, water pollution, global warming v conservation strategies coppicing, reforestation, grazing, water levels)

Feasible suggestions? - if only number 3 would come up :P

[roberto775544]

for 2, isnt that mainly unit 1

suppose a bit of osmoregualtion too.

[roberto775544]

for 2, isnt that mainly unit 1

suppose a bit of osmoregualtion too.

[discombob]

(Original post by Braund)
1) Give an account using named examples of the role of enzymes in gene technology.

2) The role of water in the lives of organisms.

3)Human influences on the environment and there effects on biodiversity(think about deforestation, desertification, acid rain, water pollution, global warming v conservation strategies coppicing, reforestation, grazing, water levels)

Feasible suggestions? - if only number 3 would come up :P

Oh boy, I would die for those questions

[giospurs]

I'm just really hoping that a mitochondria and chloroplast essay will come up. It's the only one I've revised.

[fn137]

hey one question...... in the first questions.....if the mark is 2 or 3 ....does that mean u just need to write 2 or 3 points respectively???

[yassir]

(Original post by giospurs)
I'm just really hoping that a mitochondria and chloroplast essay will come up. It's the only one I've revised.

lol u still have time to double the chances by revising not one but 2 essays or hey, go all out and revise 3!.

[Excalibur]

If 3) comes up I will cry. I know it vaguely but the whole thing is so wishy-washy!

For water, I'd say:

Brief description - dipole nature

Transport medium (as good solvent) - blood plasma for hormones/metabolic waste/respiratory gases etc; transport of water and mineral ions in xylem; transport of organic solutes in phloem; transportation of male gametes in human sexual reproduction (ie semen).

Habitat (as high specific heat capacity, density, surface tension) - aquatic environments more thermostable.

Hydrolysis reactions - using hydrolase enzymes in digestion.

Photosynthesis - photolysis of water to replace electrons lost in PSII and supply H+ for the reduction of NADP.

Respiration - metabolic water evolved as the oxygen acts as the final electron and hydrogen acceptor, used for camels.

Thermoregulation (due to high latent heat of vaporisation) - sweat; keeping plants cool in transpiration (transpiration also for pulling up water in the xylem).

Turgidity - guard cells.

[LordFSA]

^^perfect set of revision for water!

id add the fact that plasma membranes, being surrounded by water, end up with their hydrophobic tails inwards and hydrophillic heads outwards.....essential in maintaining the selectively permeable membrane........

(Original post by johnferguson1989)
maybe thats what they want you to think

oooh, dont you just hate edexcellian mind games?

[desi_navi]

In the biology options for the essay questions theres always a question on plants or environment as thats the difference in between the biology and human biology aint it?..... (Question 4B)

[desi_navi]

also..will practical stuff in the specs come up the synoptic???

[Goodfella1989]

(Original post by desi_navi)
In the biology options for the essay questions theres always a question on plants or environment as thats the difference in between the biology and human biology aint it?..... (Question 4B)

Ye that sounds correct, they always have a plant essay for the 2nd chose for people doing biology and a human question for those doing human biology, thats only difference when you sit the paper.

[tomthebum]

yeah my teacher also said somthing for water may come up....that or gene tech?