F215 - Revision thread 13th June 2011

Anyone else doing M2 and Bio on Monday?

You need to remember there are four main stages and what bacteria is involved at each stage:

1. Nitrogen Fixation This is when nitrogen from the atmosphere is turned into ammonia by bacteria called RHIZOBIUM which are inside root rudoles of leguminous plants. They have a MUTUALISTIC reletaionship with the plant (the plant gives them carbohydrates for energy and they give the plant nitrogen compounds)


2. Ammonification This is when nitrogen compounds from dead organisms are turned into ammonium compounds by DECOMPOSERS


2. Nitrification This is when ammonium compounds are converted into Nitrites and Nitrates. There are two bacteria present at this stage:
NITROSOMONAS: these convert ammonium compounds into nitrites
NITROBACTER: these convert nitrites into nitrates


4. Denitrification This is when nitrates in the soil are converted into nitrogen gas by DENITRIFYING BACTERIA. The bacteria use the nitrates for respiration under anaerobic conditions. Hence in water-logged soils there is a lot of nitrogen because there's little oxygen for denitryfing bacteria.

I'm suuuure hoping meiosis doesn't come up .. So much to learn just in case it happens to be the 8 mark question

I want it to come up though :P and yeah if it comes up, its gonna be either a few marks question saying what are the structures labeled A, B, C etc or its gonna be an essay on what happens and its significance in Variation

I've got C4 then C4 comprehension, then Biology

I want it to come up though :P and yeah if it comes up, its gonna be either a few marks question saying what are the structures labeled A, B, C etc or its gonna be an essay on what happens and its significance in Variation

The variation stuff's okay, it's the process of making the haploid cells where you have to throw in words like homologous pairs and bivalents .. I guess I'll just blag my way through it by putting in various key terms every now and again

C4 is'nt until 20th Woah now that's going to be a memorable day for you...C4 and Bio5

More likely to be a 9 mark essay if anything...its a huge topic...and it was'nt assessed much in past papers so far either...apparently the papers are written 18 months before the exam...there is just so much to know for Bio5, well at least its before Chem5 and C3!

I do MEI OCR though Hmm it could be worst I suppose! Immagine Chemistry and Biology on the same day!!

I've got C4 then C4 comprehension, then Biology

tbf though meiosis will probably have quite a few marking points on the marking and all those AVPs

You need to remember there are four main stages and what bacteria is involved at each stage:

1. Nitrogen Fixation This is when nitrogen from the atmosphere is turned into ammonia by bacteria called RHIZOBIUM which are inside root rudoles of leguminous plants. They have a MUTUALISTIC reletaionship with the plant (the plant gives them carbohydrates for energy and they give the plant nitrogen compounds)


2. Ammonification This is when nitrogen compounds from dead organisms are turned into ammonium compounds by DECOMPOSERS


2. Nitrification This is when ammonium compounds are converted into Nitrites and Nitrates. There are two bacteria present at this stage:
NITROSOMONAS: these convert ammonium compounds into nitrites
NITROBACTER: these convert nitrites into nitrates


4. Denitrification This is when nitrates in the soil are converted into nitrogen gas by DENITRIFYING BACTERIA. The bacteria use the nitrates for respiration under anaerobic conditions. Hence in water-logged soils there is a lot of nitrogen because there's little oxygen for denitryfing bacteria.

Me too! Its going to be a long day... But at least we get to leave as soon as we've finished the comprehension

I'm not sure how prepared I am for this exam - when I read through it, I feel like I know it, and I'm doing questions and I know how to answer them, but then I come on here and I feel like I know nothing! Although I have practically filled an A4 notebook with notes on everything. I've basically done my own textbook. But thats only cause I learn by writing it all down and making sense of it that way.

Aww i'm sure it'll be fine! In a way i'm glad it's C4 that clashes because I find it easier than C3 and with maths it's more practice than revision so if you get all the practice done you have enough time to revise for the other subject. But this module is HUGE. I feel I know like about 60-70% of the spec well. Some topics like DRD4, conservation and all the Galapagos stuff just do not sink in!!

Some topics like DRD4, conservation and all the Galapagos stuff just do not sink in!!