The easiest way to get a research internship is to get involved with research at the university level early on in your college career. If you work with a professor during the school year, there is a good chance that you'll be offered a position during the summer working with that same professor. Note that many/most of these positions are typically given to upperclassmen who want a career in research first.
If you want to go elsewhere for a research internship, prior research experience is usually preferred. Again, do research at your home institution, get your professor to bat for you and you should land a position somewhere. There are hundreds of them.
Here is a great resource: http://people.rit.edu/gtfsbi/Symp/premed.htm
If you want to go elsewhere for a research internship, prior research experience is usually preferred. Again, do research at your home institution, get your professor to bat for you and you should land a position somewhere. There are hundreds of them.
Here is a great resource: http://people.rit.edu/gtfsbi/Symp/premed.htm