Apps for Organic/Biochemistry and Microbiology?

I was wondering if anyone knew of any good apps for Android (and I suppose iOS for those who use Apple devices) that could be useful in Organic/Biochemistry and Microbiology. They're the only 2 classes I'm taking this Fall, but they're the 2 I've been the most nervous about since starting my pre-reqs last year (more so the chemistry). I searched the Google Play Store, but I wanted to see if anyone had any specific recommendations. I've made A's in all my pre-reqs so far, but I get the sense that this last semester is going to be a doozy, so I'd like to get whatever help I can that I can carry around with me. Thanks!