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# OCR 2010 A2 Biology Unit 2 - Control, Genome and Environment watch

1. (Original post by TX22)
for calculating chisquared will they give you values in the table?
Chances are they'll give you a half-finished table or give you all the info you need to finish a table (I can't see them making you draw a table, I think that'd just waste time). So you calculate the expected results, then the O-E squared, then O-E squared over E, then total.

For the values, they'll tell you "the critical value for XX with XX degrees of freedom is XX.Eexplain whether or not your calculated value supports Bob McBob's hypothesis."
2. (Original post by TX22)
for calculating chisquared will they give you values in the table?
yes
3. What do we need to know about GM food? Thaaaanks
4. (Original post by rayray10)
What do we need to know about GM food? Thaaaanks
yes....Golden Rice
5. Is that all? Cheers
6. just reading through the spec i found "state that cyclic AMP activates proteins by altering their three-dimensional structure." There's nothing on this in my textbook. Can anyone explain this to me, or is it just a case of being able to state it?
7. (Original post by rayray10)
Is that all? Cheers
Golden Rice is the only GM crop that you have to know about, but you have to know about genetically engineered insulin and genetically engineered transplants... are you ok with those?
8. what is the difference between vegetative propagation and tissue culture?

and how can vegetative propagation be used in agriculture?
9. (Original post by mathmagician)
just reading through the spec i found "state that cyclic AMP activates proteins by altering their three-dimensional structure." There's nothing on this in my textbook. Can anyone explain this to me, or is it just a case of being able to state it?
just state it
10. (Original post by mathmagician)
just reading through the spec i found "state that cyclic AMP activates proteins by altering their three-dimensional structure." There's nothing on this in my textbook. Can anyone explain this to me, or is it just a case of being able to state it?
You have to know that cAMP activates proteins by altering their shape. I think you might need an example in your ammo too:

PKA, protein kinase A is made up of four subunits (looks like two hole-y Coco Pops stuck to two Rice Krispies).

When cAMP isn't bound, the four units are stuck together and are inactive.

When cAMP binds, it changes its 3D structure (what you said) and releases the active subunits (Rice Krispies) - it's now active.

REMEMBER it's a secondary messenger!
11. (Original post by noodlecookie)
Golden Rice is the only GM crop that you have to know about, but you have to know about genetically engineered insulin and genetically engineered transplants... are you ok with those?
I can do genetically engineered insulin, but not transplants. Can you explain that please? Thank you so much
12. (Original post by Archen)
what is the difference between vegetative propagation and tissue culture?

and how can vegetative propagation be used in agriculture?
Vegetative propagation is natural. Tissue culture isn't, it needs manhandling.

I am not aware of vegetative propagation in agriculture... the only example I had to learn was elm trees and Dutch elm disease...
13. (Original post by noodlecookie)
You have to know that cAMP activates proteins by altering their shape. I think you might need an example in your ammo too:

PKA, protein kinase A is made up of four subunits (looks like two hole-y Coco Pops stuck to two Rice Krispies).

When cAMP isn't bound, the four units are stuck together and are inactive.

When cAMP binds, it changes its 3D structure (what you said) and releases the active subunits (Rice Krispies) - it's now active.

REMEMBER it's a secondary messenger!
this lends itself nicely to a synoptic question about protein kinase and its role in the break down of glycogen to glucose
14. is this exam in the morning or afternoon?
15. (Original post by noodlecookie)
Vegetative propagation is natural. Tissue culture isn't, it needs manhandling.

I am not aware of vegetative propagation in agriculture... the only example I had to learn was elm trees and Dutch elm disease...
i had a look:
strawberries
potatoes

apparently both use vegetative propagation
16. (Original post by chuck111)
lol looks like this is TSR's answer to racism lol
omg you are greeeeeeeat!!!!

okay, not that anyone cares, but bye. I've finished with the revision now. Cramming doesn't help me :| Good luck for tomorrow, hopefully it'd be a real good biology paper.
17. (Original post by PJ991)
is this exam in the morning or afternoon?
Morning
18. Hi all hope biology revision is going well, just wondered if anyone can sum up these two points from the spec for me please:

# explain the significance of the various concepts of the species, with reference to the biological species concept and the phylogenetic species concept.

# Describe how artificial selection has been used to produce bread wheat

Thank you
19. Also, can someone explain how you sequence DNA using BACs? My teacher only went through the chain termination method and I can't find my textbook :/
20. MSN: [email protected]

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