Biochemistry 4th Edition by Reginald Garrett, Charles Grisham

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Calculation of phospholipid-to-protein ratios
The purple patches of the Halobacterium halobium membrane, which contain the protein bacteriorhodopsin, are approximately 75% protein and 25% lipid. If the protein molecular weight is 26,000 and an average phospholipid has a molecular weight of 800, calculate the phospholipid to protein mole ratio.