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GCSE Biology 2 WJEC Help please!

Hi I have my Biology 2 exam tomorrow. I've been looking through a 2009 past paper and I could do with some help with the following questions please!!

Two Substances that are needed for active transport:
1...........................
2...........................

and

Give two environmental disadvantages of using insecticides:
1. I think I go one - bioaccumilation but I'm not sure about the second one though :frown:

2...........................

Any help would be appreciated
- thank you
(this is my 1st TSR thread :smile:

)

Reply 1

AlphaOmiga

I have my unit 2 and 3 tomorrow too so good luck!
also two substances for active transport are energy (respiration) and proteins, i think
the environmental disadvantages think that one could be can get into water supplies and can be dangerous but am not sure if any of that helps. :smile:

Reply 2

OwainPJ

Great thanks energy and proteins sounds about right :smile:

Better get back to Revision :frown:

good luck

Reply 3

Sparrow Hawk

1) Energy from Adenosine triphosphate (Primary Active Transport )or from electrochemical gradient (secondary active transport) and the 2)substrate of the protein.

Bioaccumulation in the food chain resulting in harmful effects for the predator at the top of the food chain,
also, they kill insects that are required for fertilization of other plants.

For GCSE, don't you guys get the answer schemes?