The nucleus is like the principal's office because the DNA is in the nucleus and runs everything. The principal's office is like the nucleus because it is the head of the school and everything revolves around it.

An endoplasmic reticulum forms a maze of enclosed spaces and produces lipids and proteins. The school hallway connects the school together and allows students to get to their destination. The school hallway may consist of lockers, which holds the student's books. Books allow students to produce good grades, which is like how the ER produces proteins and lipids.

Since ribosomes link amino acids to create proteins, it is just like how the teachers work together to make up the school.

So the Golgi apparatus delivers the news of the school just like the office runners delivering news to the classrooms.

The vesicles transfer materials within a cell, just like the postal service and shipping services deliver letters/packages to the families of the school.

The mitochondria converts your food into energy. When you eat at the cafeteria, you receive energy to continue for the rest of the day.

Since the vacuoles store crucial data, the databases of the school store all the information about the students and teachers.

Just like the lysosomes protects the cell, security guards protects the school.

Centrioles help when it comes for the time for cells to divide. When the time comes for seniors to graduate, counselor help them to fulfill their credits and choose a suitable college.

Like the cell wall protects the school, the school gate protects the school from invaders.

The chloroplasts capture and convert energy. The admissions a office "captures" good candidates for the school and "converts" them into a student of their school.