By the way, how did you like Caltech. Caltech is my dream school, but I've never actually talked to someone who has been there. Our chromosomal DNA forms coils and supercoils. Bacterial DNA which is usually circular forms winds, and there are enzymes called topoisomerases to change how wound up the DNA is. There are a gazillion other applications of applied math in biology.
All physiology is basically mathematical modeling of biological systems.
Neural network modeling also involves such math. Neuroimaging demands such math because the methods of obtaining noninvasive data are so involved. And all of this is just the tip of the iceberg. As for accepting linear algebra questions, when questions come up, we'll do the best we can to help. Apologies in advance if we're a little slow to respond.