Google Scholar is a great starting place for initial research. Unlike a regular Google search, Google Scholar attempts to connect you with more "academic" content then information typically found on the web. Because of this you will get links to abstracts of articles published by leading journals in the fields of Biology.
As with any web searching important evaluation work will still need to be done on each of the resources you are looking at. Use the following criteria to evaluation the information from Google Scholar or other web searches.
For more information on web information evaluation see the detailed sheet from the Meriam Library at the California State University, Chico.