# BIOL4 Biology Unit 4 Exam - 13th June 2011 watch

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1. (Original post by Zakir)
i think they'll be higher because most people are saying that the exam was easier than the jan one...

in jan 47 was an A...so it could be 55/60 for an A possibly..

but i guess it depends on how the rest of the country who sat this exam found it! :P
I agree
2. (Original post by Steerforth)
no idea what kind of equation you are trying to use.
Lol don't worry, i think i just thought it was too simple to be 0.4 so tried to complicate it! Seems like it's 0.4 though!
3. (Original post by SK-mar)
becuase it said for THIS black male and a white cat....

THIS black male must = genotype Bb
and white cat must = genotype bb

so the crosses are 50% black, 50% white = 50:50 = 1:1 ....

ALSO

for the first question did people put: The two parents have black fur but produce cats with white fur. therefore the parents must be heterozygous dominant. (this proves that the allele for white fur is recessive) ...
Surely if you cross Bb and bb you get Bb, Bb, Bb, bb... 3:1?

but yes I put the same for the bold bit
4. (Original post by Lozzah8)
I was convinced this exam would have plenty of respiration, but it didnt! So i spent 2 days learning them bloody cycles and reactions for nothing!
Anyone on the first ATP question as to why it is efficient in humans (or whatever) I put it is soluble so it is an immediate source of energy, and that it only requires one reaction.. made them up tbh!
The first part which asked two reasons for ATP being awesome they were:
Releases energy insmall manageable quantities
Releases energy immediately as hydrolysis of ATP is single reaction
5. (Original post by Sly Racoon)
Surely if you cross Bb and bb you get Bb, Bb, Bb, bb... 3:1?

but yes I put the same for the bold bit
when you cross Bb and bb you get gametes of B,b,b,b

crossing these gets Bb Bb bb bb so its 1:1
6. (Original post by Sly Racoon)
Surely if you cross Bb and bb you get Bb, Bb, Bb, bb... 3:1?

but yes I put the same for the bold bit
t 1:1 ratio. You get Bb Bb bb bb
7. (Original post by Black Butler)
The first part which asked two reasons for ATP being awesome they were:
Releases energy insmall manageable quantities
Releases energy immediately as hydrolysis of ATP is single reaction
thats exactly what i putttt

and equation i got : ATP + Pi + Energy = ATP

ATP uses in biological processes: Used for glycolysis to then produce even more ATP. used in muscle contraction for movement. used in active transport (eg. nutrients in the gut) ...
8. I didn't think the paper was too bad, made a few silly mistakes though I think.

What did everyone get for the questions relating to mites and feathers and breeding etc??
9. (Original post by SK-mar)
thats exactly what i putttt

and equation i got : ATP + Pi + Energy = ATP

ATP uses in biological processes: Used for glycolysis to then produce even more ATP. used in muscle contraction for movement. used in active transport (eg. nutrients in the gut) ...
10. (Original post by SK-mar)
thats exactly what i putttt

and equation i got : ATP + Pi + Energy = ATP

ATP uses in biological processes: Used for glycolysis to then produce even more ATP. used in muscle contraction for movement. used in active transport (eg. nutrients in the gut) ...
For the next part I put ATP only releases small amounts of energy so a lot of ATP is needed. Processes include maintaining a high body temperature (higher than out side) and movement specifically muscle contraction
11. (Original post by Black Butler)
The first part which asked two reasons for ATP being awesome they were:
Releases energy insmall manageable quantities
Releases energy immediately as hydrolysis of ATP is single reaction
i put energy can be released in a single hydrolysis reaction then immediately reformed in a condensation reaction duno if its right though.
12. (Original post by SK-mar)
when you cross Bb and bb you get gametes of B,b,b,b

crossing these gets Bb Bb bb bb so its 1:1
Ah my days, I seriously need to learn to check over stuff :| but thanks
13. (Original post by Laura-Robbie)
14. any one got an unoffical mark scheme ?

what did evryone write for the great tit brids questions ?
15. what did anyone write for the null hypothesis? I don't even know what it is.
16. (Original post by Laura-Robbie)
What youve written is more correct and more acceptable although they both are because it is frowned upon to write energy in an equation. But both are correct.
17. (Original post by abzzzg)
what did anyone write for the null hypothesis? I don't even know what it is.
there is no relationship between number of feather mites on birds feathers and the breeding success. Something along those lines would be acceptable
18. (Original post by abzzzg)
what did anyone write for the null hypothesis? I don't even know what it is.
you use it in the ISA
19. I think that went alright! Thought it was easier than the Jan paper, but hopefully grade boundaries aren't too high!
The last long answer questions were lovely although the feathered mites...not so :P
20. (Original post by cleo101)
i put energy can be released in a single hydrolysis reaction then immediately reformed in a condensation reaction duno if its right though.
Of course that is correct.

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