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Your friend has just been diagnosed with melanoma and is seeking your help She has...

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Biology

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Your friend has just been diagnosed with melanoma and is seeking your help She has been told that one of her genes has a point mutation where an A base replaces a T base resulting in a mutant protein in which a glutamic acid has replaced a valine The mutant protein BR has much greater activity than the wild type protein and this increased activity causes increased cell division Based on this case history the gene coding for the normal BR protein is likely to be O a proto oncogene O a tumor suppressor Oeither a tumor suppressor or a proto oncogene O neither a tumor suppressor nor a proto oncogene Incorrect The question describes the mutation as activating the protein rather than inactivating it Tumor suppressor mutations act recessively they must be present in two copies in order for the cells to lose control over division X X

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