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How do some toxic chemicals cause environmental and health problems? (2 Marks)

Persists in the environment/soil/water. Enters the food chain and builds up the higher up the chain you move. Can enter human tissue eventually.
TD
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Describe the function of receptors in the skin. (2 Marks)

Detect surounding stimuli. Convert that information to impulses and send to the brain.
TD
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(Substrate) is hydrolysed by (Enzyme). Explain why (Enzyme) catalyses only this reaction. (3 Marks)

Active site of (enzyme) has a specific active site, complementary to (substrate). Only that (substrate) can bind to this active site to form an enzyme substrate complex.
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Discuss the view that pressure groups make the UK more democratic.

Split into yes v no, with around 2 or 3 paragraphs for each side of the argument (depending on marks for the question). Yes: they represent minority views (with about 3 different pressure group examples focu...
AG
Answered by Annabel G. • Politics tutor
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Describe how sigma and pi bonds form and describe how single and double bonds differ.

The sigma bond results due to the overlapping of orbitals along an inter-nuclearaxis. In other words if two s orbitals are directly overlapping, then the bond formed is linear between the two nuclear centres...
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Answered by Neil G. • Chemistry tutor
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