I am an undergraduate student in the US getting ready to apply for some research internships as well as cold emailing some professors for some opportunities (all in the US). This will be the first time I will be applying for a research internship; that is, I do not have any previous internship-based research experience. I've noticed that undergraduates who have completed research internships tend to have a "Research Experience" section on their CVs. I have, on the other hand, completed a few courses with significant research components.
Is it acceptable if I include a "Course-based Research Experience" in my CV wherein I briefly explain (using a couple of bullets) the kind of research I did in these courses or am I better off having that information in a cover letter? The issue is that some internships don't allow me to submit cover letters and for the ones that do, if I try to describe the kind of research I did in detail, the cover letter ends up being longer than ideal.