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Define the term relative isotopic mass. (2 Marks)

Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)
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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.
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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.
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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...
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Answered by Annabel G. • Politics tutor
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