So we see that Coenzyme Q, also known as Ubiquinone, shown here, is basically a small hydrophobic molecule that is dissolved in the inner mitochondrial membrane. And it acts as an electron carrier that shuttles electron from protein complex one or protein complex two, ultimately, to protein complex three. Now, in its oxidized form, we call it Ubiquinone Q. And this is what the structure actually looks like. And notice we have a long hydrophobic tail. In humans, the end value is usually ten.