Ganciclovir: a drug (technically, a prodrug) that is harmless to eukaryoticplugin-autotooltip__default plugin-autotooltip_bigeukaryote: organism whose cells have membrane bound organelles, including the nucleus. cells but causes cells to die if it is acted upon by a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) called $tk^{HSV}$ from herpes simplex virus 1.