Based on evolutionary relationship, the most closely related organisms will have the most similarity in Cytochrome C structure.
What is cytochrome C?
Cytochrome C is a mitochondrial protein molecule which functions as an electron carrier in the electron transport chain.
Closely related organisms have similarity in genes as well as in protein structure.
The most closely related organisms will have the most similarities in genes and proteins structure.
Therefore, the most closely related organisms will have the most similarity in Cytochrome C.
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