My analogy is animal cell:school

Cell membrane
The cell membrane is the school building because the building protects the students and the cell membrane protects the cell

the nucleus is the principal because the nucleus controls the activities of the cell and the principal controls the activities of the school

Nucleus

Ribosomes
The ribosomes is the cafe because that's where we get our protein

E.R
The E.R are the lunch ladies because they are always in the cafe

Vacuole the vacuole is the kitchen because that's where we store my food water and waste