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he constituents of the electron transport chain have similar capabilities with the exception of ubiquinone (coenzyme Q).
What is different about ubiquinone?

a) ubiquinone is a protein that begins the ETC so it accepts the highest-energy electrons
b) ubiquinone is a protein that serves a s a regulator of the rate of redox reactions in the ETC
c) ubiquinone is a protein that is a constituent of all cells, prokaryotic or eukaryotic, hence its name, origination from "ubiquitous"
d) ubiquinone is not a protein, is lipid-soluble, and can move through the inner mitochondrial membrane

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Answer:

Option D- ubiquinone is not a protein, is lipid-soluble, and can move through the inner mitochondrial membrane

Explanation:

It is made up of redox active quinoid moiety and also a hydrophobic tail. This predominant form is also found in the humans as coenzyme Q10, this 10 signifies the number of isoprenoid units present in the tail. But in case of the rodents Q9 is seen. This is found in the inner mitochondrial membranes and are seen as antioxidants which also helps in the regeneration of the tocopherols. The molecule is fat soluble and can be best absorbed with the fats as well as the oils. So this is taken with the bigger meal of the day.

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