That's "enough food" only if your bodyweight is increasing each week.
Yes, as long as the rest of your routine is well-designed.
In no particular order: Rows, pulldowns, pull-ups, one-arm rows, deadlifts. There's no need for anything fancy.
Pretty good line, in a nutshell.
You should be concerned about training everything - upper body, back, arms, legs, everything. Sticking with a complete program will have much more impact on the results, or lack of results, than some isolation work.