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Melanin is a pigment produced in specialized cells called melanocytes. The classification of melanin falls under the molecular level of structural organization as it is made up of complex molecules that impart color to skin, hair, and eyes.
There are six levels of structural organization. These consists of chemical, cellular, tissue, organ, organ system, and organismal.
phylum
O=C=Ofor CO2, cabon dioxide
a. primary b. secondary c. tertiary d. quaternary Its e. All of the above, any change to any of the structural levels of organization can change the fuction of the protein
The simplest level of organization as far as taxonomy goes would be the most inclusive one; a domain. If you are asking in terms of things such as organisms, it would be the smallest, the cell.
Cytology is the study of cells, so therefore, a Cytologists main area of study would be the Cellular level. :)