Most have a code after the course number on the transcipts that are a tell tale sign. For example, I took an online course for Math 131. On my transcripts, it says Math 131OL. Be sure to check with the schools you are applying to though, as to their policies on online courses for prereqs. Some nursing schools don't accept online courses for transfer at all and/or only allow online classes for any other class but for the sciences, they WILL NOT accept any online credits.