試題詳解

13. The plasma membrane of E. coli consists of approximately 75% lipids and 25% proteins by weight. For each protein molecule with an average molecular weight (Mr) of 50,000, how many membrane lipid molecules (average Mr 750) are present?
(A) 2
(B) 20
(C) 200
(D) 2,000
(E) 20,000