What do you mean?

Edit: If you're disdainful of the "BA", you should be aware that there isn't any formal distinction between a "BA" and "BS", and every school decides for itself what type of degree to award.

Northwestern University happens to award BA degrees for biology: http://www.biosci.northwestern.edu/undergraduate/

> The undergraduate life sciences major offered in Weinberg College of Arts & Sciences is the Bachelor of Arts in Biological Sciences with concentration in one of five areas: biochemistry, genetics and molecular biology, neurobiology, physiology, and plant biology.