It really depends what you want out of your career. I am currently doing a PhD in developmental biology. There are posts available in this field which don't require a PhD-you can probably start as a lab technician who would maybe be responsible for day-to-day lab duties but also start to master some of the techniques. You would be able to work your way up the scale this way. However, if you have your sights on a very research-orientated career and maybe hope to become a team leader or go even higher, then you probably do need to do a PhD. Good luck.