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Mock: Chemical messengers

The following mock exam is a partial Paper 1, focused only on chemical messengers. On a true Paper 1, you would have a range of content. Paper 1 is 90 minutes. It has two questions for Part A, two questions for Part B, and a choice of one out of two questions for Part C. This exam has only one question for parts A and C. You should spend 10 minutes on the first question, and then 50 minutes on the essay. After...

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