AQA A2 Biol4 January 2012 pre- exam discussion

what was the grade boundaries for the june 2011 paper?

what was the grade boundaries for the june 2011 paper?

Why are people asking for these? You know you can just type it into google. Do not underestimate the google power.

53 for an A, 57/58 for an A*..
I think

Are you sure? That's really low xD Was it like a super hard paper or something?

I think the last question will have the following topics, which are slightly inter-linked:

- Name and explain factors contributing to the greenhouse effect. (5)
- Explain the consequences of the greenhouse effect (knowing AQA, on an obscure named species of plant/bird) (5)
- Something to do with the distribution and explanation of anaerobic microorganisms if global warming continues (maybe in places that were not flooded before but are now..waterlogged areas perhaps?) (5)

Last point seems far-fetched but AQA follow the policy: 'Any Question Allowed' haha

53 for an A. fml, even despite that was an easy paper

please can someone answer this??

In a population of otters the allele frequency of the recessive allele t, was found to be 0.2
Use the hardy-weinberg equation to calculate the percentage of homozygous recessive sea otters in this population???

Can someone list a rough list of everything from the past units we should know:

enzymes
structure of chloroplast and mitochondria
............

thankyou! basically, i understand the nitrogen cycle and because there's always loads of questions on it, i did them and understand that, but i haven't practiced the carbon cycle so i don't know how to do this question:

'Microorganisms make the carbon in polymers in a dead worm available to cells in a leaf. Describe how.' 5 marks


and with human populations, i don't know how to calculate the birth rate and death rate etc

with natural selection types, it's basically just learning the different types right?

and with succession, do we need to learn about secondary succession too?

thankyou so muchhhhhh

No this is wrong - you've confused ammonification with nitrogen fixation. Saprobiotic bacteria are the ones that release ammonia into the soil, and then the ammonia is converted to ammonium ions.

Ha Yes we Photosynthesise

... no its doesnt some do some dont you can pick them out, im not trying to mock you btw, just in a funny mood. Getting nervous now :/

When an animal is young a higher proportion of the food it takes in is converted to biomass as it is growing in size. Older animals grow less, so respire or excrete more of their food, so this reduces productivity. Therefore less food is wasted and productivity is greater if you slaughter an animal before this point.

0.2^2 x 100
why is that difficult?

0.2^2 x 100
why is that difficult?

WOW REALLY!? That's amazing, super happy now Thank you!

mine starts at 8:30 am o-o