By googling this keyword:
"theoretical biology" and physics, I get many interesting pages, such as:
- Physics meets biology: Bridging the culture gap
- Biology is more theoretical than physics
- Why physicists like models, and why biologists should
- Biology is the new physics (note that this article's title is somewhat misleading in my opinion)
All pages I found mostly (or only, if I remember correctly) focus on the advantages of the physicists are their math background and being a neophyte so sometimes able to bring fresh perspectives to a problem. But that means a mathematician is also adequate to this.
My undergraduate dissertation is about biophysics, so I actually know that there are things that a physicist can help in biology. But mostly I see them in molecular biology. What else can physicists actually help with given their background?