At UCB, the main biology majors (integrative biology, molecular and cell biology) are in the College of Letters and Science, which admits only to the division, not the major. Neither is impacted, so passing the prerequisites (C or higher, 2.0 GPA or higher) allows declaring the major.
http://ib.berkeley.edu/undergrad/major/declaring.php
http://mcb.berkeley.edu/undergrad/major/major/declaring
There are some smaller biology majors in the College of Natural Resources as well.
At UCSD, biological sciences is an impacted major.
http://biology.ucsd.edu/education/undergrad/admission/capped-major.html