Question

the role of the cell membrane is most like the job of which person?
a firefighter who evacuates people from a burning building
a police officer who allows select people to enter and leave a crime scene
a bus driver who drives the express route from the suburb to downtown
a teacher who keeps students in the classroom during an exam

Explanation:

The cell membrane is a selectively permeable barrier. It controls what enters and leaves the cell. A police officer at a crime scene allowing select people (like investigators, not random passers - by) to enter and leave is analogous. The firefighter's role is mainly about evacuation (not selective entry/exit). The bus driver's job is about transportation along a route, not control of entry/exit. The teacher keeping students in during an exam is more about containment (not the two - way, selective aspect of the cell membrane).

Answer:

a police officer who allows select people to enter and leave a crime scene