The factors of an experiment is considered as independent because it does not change or not dependent on other while on the other hand, the data is the dependent variable due to its dependency on the treatments. No, people will not pick up a dollar bill which is dropped on the floor in the airport during a pandemic because they can't put their life in danger for a dollar. They knew that life is more important than money.
Gel electrophoresis separates fragments on the basis of weight and electric charge. Heavier and/or positively charged fragments don't go as far as lighter and/or negatively charged ones.
