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Below are images of cytidine and guanidine. When these two nucleosides interact as a base pair in an RNA, they form hydrogen bonds. Indicate on the right hand molecule an atom that H-bonds to the oxygen atom at C2 of the pyrimidine heterocydic ring of cytidine. Double click to select atoms. If there is more than 1 correct answer, just give one. . You can zoom in and out using the mouse scroll wheel (or pinch to zoom on touch screens): cytidine guanidine ball & stick labels Highlight atom Submit Answer Try Another Vursion 2 tom attempts remaining