Current homework policy is to allow questions where the user has shown evidence of trying to answer the question. This is reasonable if there is a definite biological question, the answer to which may be of more general interest. And that is the crux: this site should be about explaining or discussing biology of general interest.
However if a student posts an MCQ there is no general biological question involved. An MCQ is designed (often badly) to test a student's understanding of a concept. It may be amusing for the more knowledgeable of us to see what trick an instructor is trying to play, and to demonstrate our ‘cleverness’ in answering, but in doing so we are going against the objectives of Biology StackExchange and discouraging anyone seriously interested in Biology to participate. As a quite recent contributor (more used to the standards of Stack Overflow) this is certainly the impression I get from the toleration of such questions.
I propose that the policy on homework questions be changed so that any MCQ posted on Biology StackExchange be automatically disallowed.
This need not prevent the topic being aired if there is one and the poster has shown some evidence of effort. The moderator could edit the question appropriately, removing it from the MCQ format. Consider the hard case of:
Which of the following lacks DNA? a) An Enucleated ovum b) Mature RBC c) A mature spermatozoan d) Hair root
where the poster says that he thinks the answer may be a) or b) and explains his uncertainty (showing effort).
One could rephrase the question in the form:
Are there any cells in the human body that lack DNA? I can think of two but I'm not sure...
And if this does not appear to qualify as a question, then I am asking “Is there support for this suggestion and, if so, how can the policy be changed to implement it.”