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Quick look at microscopic images using illustration to better understand what the observer is viewing:

Photo 1: An onion cell seen through a microscope via ScienceforKids

When looking into the microscope, the most prominent structure you will see inside of the cell is typically the nucleus. The nucleus houses the genetic material of an individual cell inside of a nuclear envelope, a double-membrane that separates the cytoplasm from the nucleoplasm. Throughout the membrane of the nuclear envelope, there are nuclear pores that allow an exchange of cellular material inside and outside of the nucleus. 

Photo 2: Cartoon image of a nucleus from Florida State University

This photo better displays a closer image of the nucleus, it’s pores, the chromatin, the materials in which chromosomes are made; and the nucleolus, the area where rRNA is transcribed and ribosomal subuinits are assimilated.