Poll: What do you think the 6 marker will be?
Embryonic Stem cells/Genetic disorders (16)
29.09%
Mitosis and Meiosis (11)
20%
Speciation (13)
23.64%
Quadrats and Transects (6)
10.91%
Limiting factors of photosynthesis in the greenhouse (9)
16.36%
ali_d123
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#81
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#81
(Original post by shezz4)
Aaah I'm nervous for tomorrow. I really don't understand the distribution of living organisms - quadrat and transect :/
Can someone suggest a link for this to help me revise?

Good luck to everyone!
distribution - http://www.youtube.com/watch?v=r9_o2...8whpnD&index=7

enjoy and good luck!
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Mrkingpenguin
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#82
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#82
try mygcsescience
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Chlorophile
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#83
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#83
I don't understand the ISAs. You're essentially given the mark scheme before hand, so how can you 'fail' them? I'm sorry if I'm being insensitive, but I just don't understand peoples' issues with them; personally I see them as given marks in comparison with the relatively hard exams from Units 1-3. Virtually everyone in my class got above 47/50 and a large number got full marks.
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azg545
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#84
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#84
I wish everyone good luck with the exam tomorrow

Posted from TSR Mobile
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Mrkingpenguin
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#85
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#85
same
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syhash
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#86
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#86
(Original post by shezz4)
Aaah I'm nervous for tomorrow. I really don't understand the distribution of living organisms - quadrat and transect :/
Can someone suggest a link for this to help me revise?

Good luck to everyone!
There was a 6 mark question on quadrats/line transects somewhere, the points in the mark scheme were:
- use of tape measure to produce transect
- placing of quadrats
- transect placed across stream
- score presence of each plant species
- use quadrat at regular intervals along tape
- repeat transect several times
- along stream
- at random or regular intervals

so you just needed 5 of those points, and the 6th mark was for QWC
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Meesh14
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#87
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#87
i think im prepared for it... cos i have been watching the mygcsescience videos on youtube and mad mindmaps and stuff. i have done notes and flashcards and now im just doing past papers.
heres a good link for some revision questions if anyone needs it...
http://www.southaxholme.doncaster.sc...%20Booklet.pdf
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Mrkingpenguin
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#88
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#88
yeah i doubt transects will come up again
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Mrkingpenguin
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#89
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#89
but enzymes is a strong possibility
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Mrkingpenguin
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#90
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#90
and embryonic stem cells as well...
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BI0
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#91
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#91
I'd love embryonic stem cells pros and cons as a 6-mark question!
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lolface32
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#92
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#92
Do we have to know the step-by-step process of mitosis and meiosis? If so, anyone willing to discuss it?
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Arshii
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#93
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#93
Hi! I'm also taking this exam tomorrow morning... I've done all my basic revision. But, the part I really find difficulty in the DNA structures.. :/ all with alleles and genes.. everything else seems fine to be honest! I was wondering if any one has any resources or any questions to practice with? And Good Luck Everyone for Tomorrow! x
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Mrkingpenguin
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#94
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#94
(Original post by lolface32)
Do we have to know the step-by-step process of mitosis and meiosis? If so, anyone willing to discuss it?
would be useful if someone could give markscheme examples of both processes please?
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Arshii
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#95
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#95
(Original post by lolface32)
Do we have to know the step-by-step process of mitosis and meiosis? If so, anyone willing to discuss it?
I think we need to know the steps of mitosis and meiosis.. and where it happens
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Mrkingpenguin
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#96
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#96
embryo stem cells – examples of
pros:


can treat a wide variety / lots of diseases / problems many available / plentiful using them better than wasting them painless
cons (possible) harm / death to embryo (relatively) untested / unreliable / may not work embryo can’t be ‘asked’ / ’embryo rights’ idea

adult bone marrow stem cells – examples of
pros


no ethical issues (in collection) or permission given quick recovery (relatively) safe
well tried / tested / know they work
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Arshii
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#97
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#97
(Original post by Mrkingpenguin)
would be useful if someone could give markscheme examples of both processes please?
Mitosis, occurs in body cells for repairing and growth.
1. The chromosomes copy themselves
2. The cell starts to divide
3. The cell divides forming a new (daughter cell), with exactly the same genetic informations as its parent cell.

Meiosis occurs in the gametes, containing the half the number of chromosomes. And basically, the divides again from mitosis forming 4 new cells, with the half number of chromosomes - 23. So, it divides twice...
Hope this helps x
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Mrkingpenguin
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#98
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#98
cons bone marrow

operation hazards eg infection few types of cell / tissue produced or few diseases / problems treated painful so may deter donors
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social outcast
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#99
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#99
Good Luck to everyone for tommorrow
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Mrkingpenguin
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#100
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#100
please vote in the poll /....
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