Reader Diane G. called my attention to A Quiz on DNA at Now I Know quizzes. Some questions were easy, others were harder, and one question is really, really dumb. You get 8 minutes to answer 19 questions.
As a geneticist of sorts, I better have gotten them all, and I did (see below; click on screenshot to go to quiz), but for a few questions I had to enter several answers before I got the right one. (You can’t proceed until you get a question right, but you can give up and start all over again.)
The questions are mostly on DNA structure, and I don’t expect non-scientists to get all of them.
Try it yourself and report the results in the comments. I bet you can figure out what the dumbest question is, but that one’s not so easy to answer!