A segment of DNA that codes for RNA, and can vary in length from a few hundred to as many as two million base pairs in length best defines a(n)

Which of the following is the best definition of a eukaryota? a. a one-celled organism that does not have a membrane-bound nucleus b. a one-celled organism that does not have a cell wall c. an organism whose cells each contain a membrane-bound nucleus d. an organism whose cells each have a cell wall