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AQA A2 Biology BIOL5 - 17th June 2015

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Original post by jordanjmcdonagh
What did you guys put for the mutation in tumor supressor genes?


Changes genetic sequence so cell division is no longer being suppressed and rapid cell growth produces tumours and then for the next Q I wrote about degenerate code
So did anyone do 10b???
If so can i get a rough idea about what you wrote? Thanks in advance :smile:
Original post by laurensmiley97
Is there an unofficial mark scheme any where?


heres my answers that i do on computer
U5.docx17.0KB
How is muscular contraction affected when Ca 2+ ion channels close (4)
I spoke about no calcium ions to move troponin from actin binding site? looking at other people's answers on here that seems to be wrong?
for the internal and external one would pathogens and response be ok ?
Original post by Badru77
The first question, answers were, Actin, ATPase and Tropomyosin, right? ....


heres my answers to the exam that i do on computer :smile:
U5.docx17.0KB
Original post by foureyes_
So did anyone do 10b???
If so can i get a rough idea about what you wrote? Thanks in advance :smile:


I did,
I wrote about mitosis, oestrous cycle and intensive farming/selective breeding

Posted from TSR Mobile
what was the answer to why they use cells in mitosis?
Original post by studenntt
How is muscular contraction affected when Ca 2+ ion channels close (4)
I spoke about no calcium ions to move troponin from actin binding site? looking at other people's answers on here that seems to be wrong?


It's because the question was about calcium channels in the pre-synaptic membrane so you needed to talk about vesicles and acetylcholine
Original post by AmyT997
is anyone doing an unofficial ms?


Heres my answers that i do on computer :smile:
U5.docx17.0KB
Original post by AmyT997
what was the answer to why they use cells in mitosis?


You need single stranded DNA in order for probes to bind as there has to be exposed bases for the bases on the probes to attach to. In mitosis the DNA is being replicated so some will be single stranded
That was a nice paper if you do not like HSW questions. I was expecting a horrible paper because it was a replacement paper but really it was not bad.

The first essay question was brilliant. I wrote about:

1) Temperature regulation
2) Blood glucose concentration regulation
3) Reflex Arc

I just tried to relate to the key points, which were the external environment and the internal environment.

Hopefully the marks scheme is kind. But i'm pretty sure the grade boundaries will stay the same.
Original post by Fuenciado
I did,
I wrote about mitosis, oestrous cycle and intensive farming/selective breeding


Phew! I feel like noone else did! Everyone seems to be talking about 10a)
Okay i think i was on the right lines then, (the que was kinda wordy) i also talked about intensive farming and selective breeding!
Original post by AmyT997
what was the answer to why they use cells in mitosis?


I put chromosomes become visible, that right?
Original post by Fuenciado
I did,
I wrote about mitosis, oestrous cycle and intensive farming/selective breeding

Posted from TSR Mobile


I did
oestrous cycle
oestrogen as a transcription factor
stem cells
intensive farming
mitosis
protooncogenes and tumour supressors
Original post by Fuenciado
I did,
I wrote about mitosis, oestrous cycle and intensive farming/selective breeding

Posted from TSR Mobile


I did
oestrous cycle
oestrogen as a transcription factor
stem cells
intensive farming
mitosis
protooncogenes and tumour supressors
Original post by Pommo1996
I put chromosomes become visible, that right?


I wrote something like this. Only during mitosis does the chromosome become visible as it is supercoiled
Original post by plasmaman
>The three molecules involved in muscular contraction (3)
>How muscle contraction is effected by myosin molecules not bonding to one another (3)

>Role of LH in the oestrous cycle (2)
>How testosterone is inhibited (3)
>How sperm cell production is inhibited (2)

>How is a generator potential produced in a Pacinian corpuscle (3)
>How are movements made jerky or slow in sufferers of MS when the myelin sheath is damaged (2)
>How is muscular contraction affected when Ca 2+ ion channels close (4)
>Advantage of synthetic cannabinoids over those in cannabis (2)
>Why do hydrophobic molecules enter the cell so easily (1)
>Something about a faulty gene and a growth factor (2)
>How do monoclonal antibodies prevent cell division from occurring (3)
>Why may the amino acid sequence remain the same following the mutation (1)
>Explain how the root tip grew away from the salt (3)
>What does the diagram show about the responses of the tomato plants to salt and gravity (3)
>Explain why there may be another factor affecting % of deaths/enzyme inhibitor/resistant gene question (2)
>Explain the role of the control group (2)
>How did the mice keep their blood glucose concentration constant (3)
>How does the data support the conclusion (with the error bars) (3)
>What does the data show about the sympathetic and parasympathetic nervous system in response to changes in blood pressure (3)
>Why use cells undergoing mitosis (2)
>DNA fragment/electropheresis question (4)
>One similarity and one difference between a tropism and a phototropism (2)

58/75


Last one was similarity and one difference between taxis and tropism
Guys if anyone wants to compare there answers or tell me how bad i failed or something
Heres my answers that i do on the computer
U5.docx17.0KB
Original post by DecantedOrange
I wrote something like this. Only during mitosis does the chromosome become visible as it is supercoiled


I think its more a long the lines of DNA probes only being able to attach to single stranded DNA
Probes can be detected even when the chromosomes are not visible, as long as they have minded to the DNA.

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