The following table will give you an idea on how to formulate an analogy in order to build your city.
Structure
Function
Analogy
Cell Wall
support and protection
factory walls
Cell Membrane
boundary, gatekeeper
security guards
Cytoplasm
site of metabolism
the work area
Chloroplasts
photosynthesis
snack bar
Endoplasmic reticulum
intracellular transport
conveyor belt
Golgi bodies
storage, secretion
packaging, storing, and shipping
Lysosomes
intracellular digestion
clean-up crew
Mitochondria
cellular respiration
energy generation plant
Nucleus
controls hereditary
boss's office and copy machine
Ribosomes
protein synthesis
assembly line
Vacuoles
storage
warehouses
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