AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

Reply 1160

tehsponge

11

Original post by Sparkly-Star

So... what's with the face? That's excellent without the essay. :smile:

I need an A overall, and I doubt I got an A in unit 4, so I really need a mid-high A in this unit :s-smilie:

Reply 1161

Sparkly-Star

OP

13

Original post by tehsponge

I need an A overall, and I doubt I got an A in unit 4, so I really need a mid-high A in this unit :s-smilie:

Oh ok, I understand in that sense. I have the same issue with maths. :frown:

Reply 1162

Rose1990

5

Original post by tehsponge

9 (d) The scientists analysed the DNA on the Y chromosome and the DNA in the
mitochondria of the Swedish wolves. They concluded that the Swedish wolf population
descended from one male wolf from Finland and one female wolf from Russia.
9 (d) (i) Explain why DNA on the Y chromosome helped them to reach this conclusion.

answer:

Y chromosome inherited/comes from male parents/only found in males;

What?! That doesn't even follow from the question...

Just some thoughts, the Y chromosome of the present swedish wolf and past swedish wolf(only 1) will be similar. Well due to crossing overs and all those meiosis bit does change some of the DNA bits but the overall DNA should be pretty much similar. Dont you think so? So the answer is relevant.. :dontknow:

Reply 1163

angel1992

hey in genetic fingerprinting is all the dna cut up into fragments?

Reply 1164

User544981

10

Original post by Cyanohydrin

'How Science Works is a load of cack used to fill up space and piss people off. Discuss'

well done u just got 25 marks for the essay thats if i marked ur paper
fantastic i love it
ill give ur post a positive rating for that

or another question cud be
Q: we have given u a really hard exam what shud we do the examiner who wrote this paper
A: :mad:

is the answer correct YES well done 25 marks

Reply 1165

percy93

Original post by Destroyviruses

I was just guessing, trying to find a reason why the book says only small strands can be used in PCR.

Maybe it got confused with sequencing.

all i know is pcr replicates smaller amounts than in vivo, which has the ability to replicate large amounts of DNA

Reply 1166

User544981

10

Original post by angel1992

hey in genetic fingerprinting is all the dna cut up into fragments?

yes it is
the dna is extracted from the cell
then cut using restriction endonuclease enzymes

Reply 1167

percy93

Original post by hahaff

well done u just got 25 marks for the essay thats if i marked ur paper
fantastic i love it
ill give ur post a positive rating for that

or another question cud be
Q: we have given u a really hard exam what shud we do the examiner who wrote this paper
A: :mad:

is the answer correct YES well done 25 marks

heh?

Reply 1168

User544981

10

guys is it compulsory to do the essay
i mean the essay is 25 marks and u cud spend alot more time on the other questions
hmm il probs do that if both the essays are based on genetics

Reply 1169

percy93

Original post by Cyanohydrin

because you can isolate a specific gene....

DNA replication does use primers, as some kind of enzyme. but not mentioned in spec

Reply 1170

skygirl999

6

Does anyone know what the difference between RNA polymerase and DNA polymerase is? Is it just that RNA polymerase is used 'naturally' in cells? Or is it that RNA polymerase is used to make RNA (so replaced thymine with uracil) wheras DNA polymerase is used to make DNA (so uses the bases CGTA)?

Reply 1171

angel1992

in the nt it says that genetic fingerprinting pcr is used to amplify the dna sample, does it amplify all the dna sample, and if so how, i though all the dna sample couldnt be amplified in pcr, which only amplifies small amounts?

Reply 1172

percy93

Original post by Destroyviruses

Lol !

Private schools try to make you conform and be normal

Art schools encourge you do deviate from the norm!

hahahahahahhahhhahha... that always gets me

Reply 1173

5mattcolour

I'm bricking myself about this exam! I've covered everything in the spec but there's so much to remember! And my essays have consistently been B/C grade. I really need a B in this unit so I'm hoping for a fairly nice essay.

Reply 1174

tehsponge

11

Original post by hahaff

guys is it compulsory to do the essay
i mean the essay is 25 marks and u cud spend alot more time on the other questions
hmm il probs do that if both the essays are based on genetics

Well you could still get an A even if you left the essay, lol. You'd be able to get a max of 75% without even touching the essay, but you'd have to be a HSW god.

Reply 1175

kingsmod1

guys for chap 13 i dont understand it says fsh stimulates oestrogen to be prodcued but then oestrogen inhibits fsh?

for up to day 10 oestrogen stimulaes rise in fsh, wtf though it inhibits it?????

MANY THANKSSSSSSSSSSSSS

Reply 1176

percy93

Original post by OriginOfShowbiz

I could only find June 2010. Out of a total of 100:
A* - 69
A - 62
B - 55
C - 49
D - 43
E - 37

this made me cream my pants

Reply 1177

5mattcolour

How much detail will I need on translation? Is this ok:
(Happens in cytoplasm of cell)
1: Ribosome binds to mRNA, finds the start codon (AUG)
2: tRNA brings correct amino acid to the ribosome
3: Ribosome reads the next codon
4: tRNA's continue to line up amino acids along the chain
5: Peptide bonds join amino acids
6: Ribosome continues along mRNA until it reaches the stop condon

Reply 1178

percy93

Original post by kingsmod1

guys for chap 13 i dont understand it says fsh stimulates oestrogen to be prodcued but then oestrogen inhibits fsh?

for up to day 10 oestrogen stimulaes rise in fsh, wtf though it inhibits it?????

MANY THANKSSSSSSSSSSSSS

oestogen inhibits FSH at low levels, but once it exceeds a certain concentration at around 10 days usually, it stimulates it (positive feedback)

Reply 1179

percy93

Original post by 5mattcolour

How much detail will I need on translation? Is this ok:
(Happens in cytoplasm of cell)
1: Ribosome binds to mRNA, finds the start codon (AUG)
2: tRNA brings correct amino acid to the ribosome
3: Ribosome reads the next codon
4: tRNA's continue to line up amino acids along the chain
5: Peptide bonds join amino acids
6: Ribosome continues along mRNA until it reaches the stop condon

you need to refer to how the anticodon of tRNA binds to the codon of mRNA. :wink:

AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

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