Per MLA, if I am quoting a question and it is the end of the sentence how do I punctuate?

Question

Example) the quote is this..."Is it scientifically sound?" and "Is it realistic?"

how do I punctuate... "Is it realistic?." OR "Is it realistic?". OR just leave it as "Is it realistic?" I looked for it in the handbook and did not find an example

Answer 1

No period if you use the question mark.

I can see the logic of having both a period and a question mark when you enclose a quotation at the end of a sentence, but the rule is you don't use one.