Answer:If a whole cell is a city, let’s just call it Cell City, then its cell membranes have to be the edge of the city’s territory or the city walls; everything that happens outside of its boundaries and jurisdiction are not really Cell City’s direct concern. Going further inwards, you’ll see many different people doing different jobs, and you’ll see shops and businesses, like barbers, bakeries, cleaning services, and so on, each tailored to the specific needs of Cell City. These are the proteins and protein complexes, which fulfill different roles within the city. Cell City’s nucleus, from which everything is directed, is the City Counsil. Every single plan and design, the DNA, for the city is contained in there and nothing will happen without it. Of course, a city would want to keep that information in one place and direct it from there, so you have to make sure it stays in there. That’s what the nuclear membrane is for, to keep it all within the confinements of the city hall. Eventually, these plans have to turned in something useful. Consider you’d want a new supermarket to be built in Cell City and you already have the plans for it. The first thing that would happen is the relaying of copies of the plans (RNA), to professionals, like contractors and building crew (ribosomes). They order and assemble the building blocks of the supermarkt, amino acids, according to the plans. The assembly sites might be everywhere, but some parts or even whole structures may need special care or treatments and have be produced at industrial parks, like endoplasmatic reticulum. Trucks are also needed to transport certain products within the cell, these are vesicles and the associated motor proteins, which move according to roads, like filaments of the cytoskeleton. Every modern city requires electricity (ATP) to keep itself running. Cell City also has power plants, the mitochondria, which need fuel (generally glucose and oxygen, but alternative power sources are also used) to keep producing that energy and makes waste products in the process (carbon dioxide and water).
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