Thanks for the insight.
As a brief background I goofed my first 2 years because I wasn't mature/serious etc, ended up with 2.9ish GPA and bad pre-reqs. Got serious junior year, been holding about 3.7 average with upper division courses for an entire year - including A in organic 3, A- and A 2 biochemistry courses.
Based on my upward trend, probably don't NEED to retake - I do plan on retaking 3 Cs in chem2, cell bio, and bio 2, however.