The acceptance rate are usually released in May. Due to the California budget cuts for colleges I wouldn't be to surprise if the acceptance rate are lower than last year.
Here is some news about the application rates:
UC Merced - News Archive
@solong
I don't know about UCR or UCSC but, UCM has a natural science program, engineering pro, and a social science,humanity, and arts program. Biological science and bioengineering are the two top majors in UCM.
Informational Websites:
https://eng.ucmerced.edu/soe/acad-prog Source | School of Natural Sciences