Hey there, I had the same question when I was applying last year. As a student from UCI, there's only one quarter of Biochem that a non-biochem major could take, and Loma Linda being my top choice, I was really concerned about this. After even enrolling in a entire semester long biochem class that I didn't even need to take, and tons and TONS of phone tag with Loma Linda, it turns out that they count Molecular Biology as the second quarter of Biochemistry. At UCI Bio98 (Biochem) and Bio 99 (Molec Bio) were part of the lower division core classes - I'm not sure how it is at UCLA, but I think it'd be something similar. All of the other schools I applied to that required 6 quarter units of biochem never really had any problem with it, so I'm guessing it's similar across the board to Loma Linda.
So in conclusion, 2 quarters of Biochem can equal 1 quarter of Biochem, 1 quarter of Molecular Bio.