The undergraduate students are usually very excited about doing real science. Yes, they will forget to do the positive control the first time they perform an experiment. But that's what you're there for. When you go to meetings, you will eventually see many students whom you have taught. They will not be known as your students.
Different schools have different rules and different expectations.
Many undergraduate institutions are now trying to raise their standards by expecting more research from their faculty. However, not all of these places can give their faculty the support they need to do this work. For instance, summer salaries can be critical. You should know in advance what the school's publishing expectations are, what their leave programs are, and what the campus attitudes are concerning science and tenure. Attitudes to science vary.