The answer to this question lies in the preparation you did before the interview. It is extremely important that you research the requirements of the position well and match them with your skills.
For e.g. if the position requires an Asp.net developer with good knowledge of health care domain, tell the interviewer about your technical skills and your domain knowledge.
The field of IT is very revolutionary. It is extremely important to keep yourself abreast with the new technological developments and this needs you to take some time out of your work schedule so that you can keep sharpening your saw.
To answer this question, you can tell the recruiter about the forums which you keep visiting, blogs which you keep reading. It will be an advantage if you are a member of some local user group.
The purpose of this question is to see how well you can fit into a team. Basically, you should not have a problem with a person, although you can have a problem with the style of working.
So, to answer this question you can simply say, I understand that IT is about team work, so we cant afford to problems with co-workers but if someone is not serious about their work or does a low quality work affecting the whole project, I definitely do not like it