"Are those they" is correct. "Are" is a form of the copulative verb "to be" and is not transitive. In this sentence it is linking two subjects; "them" is the accusative form of the pronoun "they,"...
It is easier to answer this question by means of examples:
Example 1:
1. What are those colors that you see in a rainbow? 2. They are violet, indigo, blue, green, yellow, orange, and red. Example...
= those quotes are- quotes is plural =
Added by Sneighke: I have an issue with this answer as the question is ambiguous. Speaking of an actual "quote" you would say "that quote is" or "the quote...