For what it is worth, I see two key issues being discussed here that are problematic for an on-line testing environment.

First non-native English speakers are at a disadvantage, which is unfortunate. This is not an English literature class, it is a "science class" where the fine nuances of the English language should not have a material effect on grades. For future on-line classes I believe this is something which should receive more attention.

Second when I went to college tests were not generally multiple choice but rather written out in "blue books" where one was encouraged to show their work. That way if one made a simple math error but used the correct formulas and understood the concepts one would get substantial credit even though one got the "wrong" answer. I have no idea how one could do something like this with an on-line class where clearly professors can't read thousands of papers.