Scrum questions

Hi All-
Call some one help me with following questions

1- Can iteration Back log include Use Cases?

2- Can product back log also contain user stories? In my experience with managing Agile we only have PBI not user stories but I am taking online CSM course from a source where it says Product backlog can have User stories.

3-If a Development team member is not a team player who is responsible for Firing him/her


Thanks