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F1's Finest
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#2581
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#2581
(Original post by MLogan)
Can someone please indicate to me at what stage there are positive and negative feedback mechanisms occuring in the oestrous cycle. Thanks in advance
1st Negative Feedback: When the levels of oestrogen begin to rise just after the beginning of the cycle. This inhibits the release of FSH.

Positive Feedback: When the levels of oestrogen continue to rise and reach a critical point where oestrogen now stimulates the release of FSH and LH.

2nd Negative Feedback: Happens after ovulation where progesterone inhibits the production of LH and FSH.
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ynm1
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#2582
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#2582
Can someone please help me with question 4b)!!! Mark scheme is quite vague
http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
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MLogan
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#2583
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#2583
(Original post by James A)
1st Negative Feedback: When the levels of oestrogen begin to rise just after the beginning of the cycle. This inhibits the release of FSH.

Positive Feedback: When the levels of oestrogen continue to rise and reach a critical point where oestrogen now stimulates the release of FSH and LH.

2nd Negative Feedback: Happens after ovulation where progesterone inhibits the production of LH and FSH.
Thank you too You know your stuff pretty well, Well done!
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SamEastie
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#2584
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#2584
(Original post by MLogan)
Thanks a lot Would give +rep but finished it :|
no worries! i like my little red bar anyway..
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F1's Finest
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#2585
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#2585
(Original post by MLogan)
Thank you too You know your stuff pretty well, Well done!
No worries.

Helping others on here also helps me to remember things too! Sharing info with others makes learning a two way process!
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06spam
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#2586
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#2586
Please could some one explain to be restriction mapping?? in particular question five on the June 2011 paper!!! pleasee!!
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dizzy17
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#2587
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#2587
for an adaptation of a fast twitch muscle fibre for anaerobic respiration, my book says thicker and more numerous myosin filaments. How does that exactly adapt it for this? Thanks for any help!
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F1's Finest
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#2588
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#2588
(Original post by dizzy17)
for an adaptation of a fast twitch muscle fibre for anaerobic respiration, my book says thicker and more numerous myosin filaments. How does that exactly adapt it for this? Thanks for any help!
Thicker filaments result in stronger contractions.

Stronger contractions are a property of fast twitch fibres.
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SamEastie
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#2589
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#2589
(Original post by SamEastie)
no worries! i like my little red bar anyway..
aha getting negged for that.. wow.
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FM1994
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#2590
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#2590
Can someone give me a list of the main synoptic topics for this exam?

Thanks


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AVB
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#2591
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#2591
(Original post by peebs123)
Does anyone know what the grade boundaries were for the unit 5 specimen paper on the AQA website?
Anyone else find that paper really hard?
Did it today, and being honest I thought the actual paper wasn't that bad...

Both essay titles were awful though!


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jonnyb123
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#2592
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#2592
So I thought in gel electrophoresis the sequence of bases in the original fragment was complementary to the sequence on the gel, because those are the complementary terminator nucleotides that binded to the original sequence. That's what it says on page 269 anyway (Nelson Thornes). But on the on the next page in question 3 the answers just correspond to the sequence on the gel, i.e. they aren't complementary...how do you know which one they are asking for?
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flyylikejetz
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#2593
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#2593
(Original post by ynm1)
Can someone please help me with question 4b)!!! Mark scheme is quite vague
http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
follow the story of increasing higher conc. to the critical point of oestrogen causes release of more LH & FSH (hence positive feedback). the key point its the increase in oestrogen that causes increase in LH. increase:increase instead of increase:decrease (Negative feedback)
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Anjna
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#2594
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#2594
can someone PLEASE explain q4aii) and why the answer is B? http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
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_sa
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#2595
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#2595
What are people predicting for the essay titles?
I'm thinking maybe one of them will be on ATP!
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Anjna
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#2596
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#2596
(Original post by Anjna)
can someone PLEASE explain q4aii) and why the answer is B? http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF
anyone ?
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ahmmm
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#2597
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#2597
(Original post by James A)
No worries.

Helping others on here also helps me to remember things too! Sharing info with others makes learning a two way process!
are you only revising those 7 essays we were talking about the other day?
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ahmmm
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#2598
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#2598
(Original post by _sa)
What are people predicting for the essay titles?
I'm thinking maybe one of them will be on ATP!
i bladdy hope so !!
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DoeADeer
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#2599
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#2599
(Original post by ahmmm)
are you only revising those 7 essays we were talking about the other day?
Sorry to butt in, but where are these seven essays if you don't mind?
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gingerandice
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#2600
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#2600
(Original post by dizzy17)
for an adaptation of a fast twitch muscle fibre for anaerobic respiration, my book says thicker and more numerous myosin filaments. How does that exactly adapt it for this? Thanks for any help!
more powerful contractions
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