Ruth Scott’s job is to be the No. 1 cheerleader for biotechnology in Washington state. But when politicians talk up the industry as a silver bullet for job growth, she cringes. People ask her: Will biotech create hundreds of thousands of high-paying jobs? Can we retrain 30,000 laid-off Boeing workers to make biotech drugs? Scott, president of the state biotechnology trade association, would like to say yes. But she knows better.