Yes. You need rice to make the bean protein complete.
Nope-white rice has a mere 9% protein per serving-and it is nearly 89% carbs-all starch, and less than 10% of any useful nutrients. A serving of pinto beans has 45 gms, of plant based carbs-no starch-and 15 gms of protein, plus thiamine and several other useful nutrients. White rice does not add any useful nutrition to beans-just carbs. That is from the handout the local gym has on the front desk...