The pathway to be a lecturer is not the same pathway to be a teacher.

You don't need to get a specialized degree in Education to be a lecturer.

First of all, which field are you interested in?

Say, if you are interested in psychology, then you need to have at least a Master's degree in Psychology and perhaps a doctoral degree in Psychology.

As long as you have a Master's or undergraduate degree in a similar field to biology, I'm pretty sure you can teach biology at the foundation level.