Explain how RNA processing, specifically alternative splicing, is used as a form of post- transcriptional control. (3) 4) Discuss the role of BCL2 family proteins in regulating the intrinsic pathway of apoptosis. (3) 5) Explain why cancer is most commonly detected in older people. (3) 6) Not all the cancer cells in a particular tumour are identical. Describe 2 ways in which they can differ and explain the effects this heterogeneity can have on cancer therapy

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