"The part that really spoke to me about this position was the chance to combine both the research skills I gained from being an intern and my ability to quickly pick up how to use various laboratory software. This position will actively let me grow and learn from other medical professionals."
This question is to learn more about you and why you want to work for their company. The first thing you will want to do is to express your enthusiasm for the company. Be positive and upbeat. Tell the interviewer how your skills and work experience line up with the role you are applying to. Express to the interviewer that you are ready to grow with this company and not using it as a stepping stone to your next opportunity.
"A weakness of mine is public speaking. In my last feedback with my supervisor, we discussed my weakness and we are now working together to improve it. He has given me the opportunity to interact with small groups to give me the practice that I need to one day speak to large audiences."
As a Bacteriology Technician, you have weaknesses and that's ok. This question will give you the opportunity to tell the interviewer what your weaknesses are and what you are doing to improve yourself. Don't choose a weakness that is a job requirement.