Our understanding of cell biology can contribute to public health in several ways:

1: Medicine: Knowledge of cell biology can provide knowledge of the diseases, which can help in designing new drugs that target that diseas.

2: Prevention of diseases: Understanding the cellular processes that lead to disease can help in identifying risk factors and developing prevent disease that could get terrible

In summary, our knowledge of cell biology can contribute a lot to public health by providing knowledge into diseases,  and letting people know about what we can be scared of and what is happening in the world.