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BIOL4 Biology Unit 4 Exam - 13th June 2011

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im so confused
what if you breed bbi and bbi - both will be chocolate but theres still a chance of producing cinnomen :s
ahh! soo many silly mistakes
i need an AAAAA! :frown:

yeh but i never said breed 'bbi' and 'bbi' .... i said breed 'bb' and 'bb' OR 'bb' and 'bbi' ....

Reply 1481

SarahTM

Original post by choc1234

im so confused
what if you breed bbi and bbi - both will be chocolate but theres still a chance of producing cinnomen :s
ahh! soo many silly mistakes
i need an AAAAA! :frown:

I put bb, because if you had offspring it could have bi recessive... Then later in breeding, if another bi was present cinnamon offspring would be produced...

EDIT: if you'd picked bbi

Reply 1482

woods.vanessa

Original post by lou12

what did people write for the question on the effects of leaching- 3 marks i think

I wrote so much :/
- eutrophication leads to increased nitrate conc
- nitrate no longer limiting factor for algae who grow exponentially (algal bloom)
-prevents light to lower layers, plants below die
-oxygen concn decreases and fish + aerobic animals die
-amount of anaerobic microorganisms increase + they produce toxic waste e.g. H2S

Reply 1483

SK-mar

Original post by lou12

what did people write for the question on the effects of leaching- 3 marks i think

- soluble nitrates leached into nearby water sources (ponds, lakes)
- nitrates stimulate growth of algae and cause algal bloom
- blocks light to plants below so they cant photosynthesis and die
- decomposers feed on the dead matter and use up oxygen for respiration
- fish and other aquatic organisms cant respire and so die
- anaerobic bacteria feed on dead matter and produce nitrates and toxic waste.

Reply 1484

SarahTM

Original post by lou12

what did people write for the question on the effects of leaching- 3 marks i think

Algal bloom feed on fertiliser nutrients...
Kills plants...
Microorganisms decompose...
Respire and use up O2 in water....
Fish suffocate...
Water uninhabitable :smile:

Reply 1485

SK-mar

Original post by SarahTM

I put bb, because if you had offspring it could have bi recessive... Then later in breeding, if another bi was present cinnamon offspring would be produced...

EDIT: if you'd picked bbi

but it didn't ask for 2nd generation did it? it just said that the breeder wanted to produce chocolate cats and having 'bb' and 'bbi' would do this. and so would 'bb' and 'bb'

Reply 1486

khimmy

Original post by lou12

what did people write for the question on the effects of leaching- 3 marks i think

i wrote the whole eutrophication stuff hehe :colondollar:

Reply 1487

SarahTM

Original post by SK-mar

but it didn't ask for 2nd generation did it? it just said that the breeder wanted to produce chocolate cats and having 'bb' and 'bbi' would do this as well as 'bb' and 'bb'

No, I just assumed if he wanted all chocolate cats, he'd want them permenantly?

Reply 1488

kingsmod1

they didnt tell u to list out, they asked u effects of leaching

so u put more anarboic produc wastes
aerboic organisms dieing lack of oxygen etc.

Reply 1489

khimmy

Original post by kingsmod1

they didnt tell u to list out, they asked u effects of leaching

so u put more anarboic produc wastes
aerboic organisms dieing lack of oxygen etc.

but its better safe than sorry? :biggrin:

Reply 1490

SarahTM

Yes, but all those things are a concequence...
Plants dying due to inability to photosynthesise is a concequence...
Increasing numbers of aerobic microorganisms is a concequence...
Algal bloom is a concequence... :smile:

Reply 1491

SK-mar

Original post by SarahTM

No, I just assumed if he wanted all chocolate cats, he'd want them permenantly?

yeh the ones he produces from those parent genotypes (bb and bb) or (bb and bbi) will be permanent won't they? they can't change fur colour during their life.

if you use a punnet square with the genotypes 'bb' and 'bb' you get all all 'bb' offspring

if you use a punnet square with genotypes 'bb' and 'bbi' you get 2 'bb' and 2'bbi' offspring.

but even the bbi offspring are chocolate as 'b' is dominant over 'bi' ...

edit: just kinda got what you mean. but yeh i dunno cos the question didn't specify that he wanted chocolate cats forever using the offspring .... anyway its a bit weird, its like the breeder would be condoning cat incest. lol.

(edited 12 years ago)

Reply 1492

SarahTM

Original post by SK-mar

True, true. I assume both answers are fine :smile:

Reply 1493

SK-mar

Original post by SarahTM

True, true. I assume both answers are fine :smile:

I edited my last post, sorry, read it now haha.

Reply 1494

SarahTM

Original post by SK-mar

I edited my last post, sorry, read it now haha.

Haha :'D
AQA promote interbreeding... That would be an interesting news headline :')
Oh well. Cat fur is much more interesting than Dogwhelks :'D

EDIT: Actually, it is condoned... And called Pedigree :'D

(edited 12 years ago)

Reply 1495

joe__

Hey guys I'm sitting this paper next year (in jan2011)
Was this paper hard?

Reply 1496

kingsmod1

Original post by SarahTM

dogwhelks??????????/ wat there come from

few of my friends missed the very Last Q at the back LOL about co2 :biggrin:

Reply 1497

SarahTM

Original post by kingsmod1

dogwhelks??????????/ wat there come from

few of my friends missed the very Last Q at the back LOL about co2 :biggrin:

Did you not do all the legacy papers? :'D
Dogwhelks is a reccuring theme xD

Ohmygod - gutted :O
6 marks as well :')

Reply 1498

joyciejones23

Original post by Rainbow249

1. For humans, I said they need it for many biological processes, such as mitosis and DNA replication, and they also require lots of ATP to maintain body temperature.

2. I ticked all of photosynthesis (PSS), all of aerobic respiration and for anaerobic respiration, I only ticked that it makes ATP. But I was confused on the PSS one, because it does make ATP but that gets used up, so does it count? Mitochondria and Chloroplast are both organelles. Can't remember what the last row was for :s-smilie:

3. I put as one increases, the other decreases.

4. The mites eat the pathogens so the chicks are less likely to catch a disease and die, so this increases breeding success.

Does anyone agree with my points? If you disagree, tell me what you put instead please? :smile:

There was a tick in every box for yours? I put a cross in production of ATP for pss, becuase net production was 0, also electron transport doesn't occur in either anaerobic respiration or photosynthesis.. Also, the mite question was horrible!!

Reply 1499

joyciejones23

Original post by lou12

what did people write for the question on the effects of leaching- 3 marks i think

I explained the entire of eutrophication lol..
So the whole process of algal bloom -> less light for lower depths -> lower species die -> broken die by aerobic saprobiotic organisms -> creates oxygen debt -> aerobic organisms such as fish -> also broken down -> water turns putrid?