I recently took quiz for an introductory biochemistry class and was asked to identify the carbonyl functional groups of a particular molecule (attached to this post). My logic was to consider amides as their own functional group, and not to acknowledge the carbonyl constituent, hence my answer of 1. But, as it turns out, the carbonyl substituents should have been acknowledged. However, the day before the quiz and in tutorial, we were asked to identify specific functional groups in the molecule guanine, among those being ketones, amides, and amines. We acknowledged the presence of the amide, but did not count the ketone or the amine. I feel a little bit misled, as in the quiz we needed to count the ketone/carbonyl, even in the amide functional groups. I just wanted to get another opinion on this to see if I could bring this up in the next office hours for a possible grade correction, or to just leave it be.