AQA Biology unit 4

Don't you also get 1 reduced NAD from the link reaction???

can anyone please upload the january 2010 unit 4 paper? quote me and upload please...

Ahhhhhhhhhhh :'(

guys do you think how science works will dominate the whole paper this time round? ive got a really strong feeling it will

Does anyone have a good way of remembering photophosphorylation, oxidative phosphorylation and substrate-level phosphorylation...I can't get the meanings to stick in my head so I keep getting them muddled

Bio+Unit+4+Jan+2010+Question+Paper.pdf

Bio+Unit+4b+Jan+2010+Mark+Scheme.pdf


Hope this works. Quote me if it doesn't and i'll try something else.

How can you remember the equations like: % population growth rate, birth rate, death rate without mixing them up?

Is it worth knowing some implications of HSW for intensive rearing?

I hope they give a big question on succession or eutrophication.


I am struggling to understand the consequences of global warming can anyone help me the amount written in the book is too long. Thanks

For a question on geographical selection is this sufficient:
This happens when a single population is split into 2 new separate populations because of a physical barrier. Usually the 2 populations experience different environmental conditions so they both have different selective pressures in their new environments. Random mutations occur in time this results in new alleles. Because of this some organisms are more adapted to their surroundings so they survive and successfully reproduce passing on the advantageous alleles to their offspring to enable their survival and success. There is no interbreeding between the two populations because of the barrier thus no gene flow. So the two populations frequency of alleles in the gene pool are so different that interbreeding is impossible as they have become 2 separate species.

im guessing this time round there will be a question on sucession, genetics hardy weinburg and eutrphication.

the stuff in the book on global warming is too long. all u need to know is that some radiation reflected back into space, some reaches the earth surface and is reflected. some radiation is redirected back to the earth by the clouds and the greenhouse gases that form part of the atmosphere.