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Difficult to write a practice question.
Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)
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.
Detect surounding stimuli. Convert that information to impulses and send to the brain.
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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