Two random questions

<p>1) For Bioengineering does BioE100 have to be taken with a letter grade or can it be taken P/NP?</p>

<p>2) Does EE 20N or CS 61B labs have open labs were you walk in to do your work and ask the gsi questions like E7 labs and you can just go to any, or is it mandatory to attend your own lab?</p>