Given the task definition and input, reply with output. You are given a list of queries separated by new line. Your job is to answer with the query that is the most well-formed or well-structured query in terms of grammar, punctuations, or spelling errors.

What cell structures are within the cell membrane ?
Space inside chloroplasts but outside thylacoids ?
Oil drain plug on a 2007 GMC Sierra ?
What Four functions of political parties include ?

What cell structures are within the cell membrane ?