nope. biceps will also get exercised when you do back. when bulking, my routine is generally this:
1 - chest
2 - back, hamstrings
3 - triceps, abs
4 - biceps, quads, calves
5 - deltoids, traps
6 - off
7 - off
my tris get hit hard on day 3, pretty hard on day 1, and touched on day 5. biceps...