No, and actually it has never been. I hate to admit this but so far I have been a 'professional student' since my undergrad days so there has been no need to really write a resume. In science research (I study bacterial genetics) people don't really write a resume, they write a curriculum vitae (cv) and there is 'no room' for extracurricular activites on a cv; and it is actually kinda frowned upon to put extracurriculars on a cv.
In science research, most people are NOT greek, so it might actually hurt more than help to put your GLO on your cv. My experience has been slightly negative when I've told some of the people that I work with now that I am in a sorority. Especially since I am over 30 and STILL wear my letters (I'm 33 and about to complete my Ph.D.

). Being greek is a stong indication that you have a LIFE outside of the lab. Imagine that!!!
If you are curious here is my life over the past 10 years:
1991 - got BS in biochemistry from Texas A&M
1992 - completed training to become a certified medical technologist
1992 - enrolled in post-bac classes at UH in biochemistry. I wanted to see if I
really wanted to go to grad school. Boy, what I did not know then.
1994 - enrolled in grad school at UH in biochemistry
1996 - got MS from UH and enrolled in Ph.D. program at UT - Houston. Yeah, I
really love school!!
2003 - anticipate receiving my Ph.D.
I did work night shift at a hospital as a med tech from '92 - '96, but the issue of being greek really did not phase people. Except for one lady who did her undergrad at LSU and when I told her I was in a sorority she kinda assumed I was a snob. From all that I have read about LSU NPC rush here on GC, now I can understand why she reacted that way.