Like a cell membrane, cell limits informs someone they are entering or exiting a city.

The sidewalks in a city contain people like cytoplasm contains molecules.

City Hall holds records of important things that have happened in the past and present. Many important documents and papers are kept in a city hall. In a nucleus, the DNA and other important molecules are kept and protected.

An assembly hall is where people discuss things like laws and such. Laws are built in these places. In the nucleolus, ribosomes are made.

The Cytoskeleton in a cell is streets in a city. A cytoskeleton is a network of proteins inside a cell that supports and shapes the cell, like streets shape neighborhoods and allow networks of people to walk.

Smooth ER is like a highway because it is an interconnected network of folded membranes. It transports things, just like a highway.

Like a newspaper company, rough ER makes proteins and transports them through vesicles.

Ribosomes produce proteins and are given instructions. Utility poles are given signals and help to generate power.

Like a Golgi apparatus, a post office packages, processes, and ships things all over the city.

A mailman carries materials to be delivered to homes and buildings, just like a vesicle.

Police officers keep cities safe from bad people and other things, like lysosomes.

When someone is about to have a baby, they go to a hospital where the doctor help them to deliver it.

An electrical plant generates electricity and power to light up the whole city and make it function, mitochondria does the same.

Some cities are surrounded by gates. These gates keep certain neighborhoods safe and keep others out. A cell wall surrounds plant cells and keeps them in a rigid shape.

A power plant generates energy for a city. It is similar to an electrical plant, but maybe more environmentally friendly.

A factory produces supplies and things for a city, like how a centrosome produces microtubes for a cell.

A reservoir usually holds water for the city's residents to use in their household and drink. A vacuole holds simialr things for the cell.