Lipid rafts present in the membrane have different composition then rest of the membrane. On isolation it was found that rafts have cholesterol to sphingolipid ratio of 2:1. Estimated size of raft is 30nm. Surface area of cholesterol is 30A02 and that of sphingolipids is 60A02. How many molecules of cholesterol and sphingolipid are present in the lipid raft.

Bio-Chemistry (M.Phil./Ph.D.) 2017 Panjab University Entrance Exam With Answers

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48.

A: 30 Cholesterol: 15 sphingolipids

B: 60 Cholesterol: 30 sphingolipids

C: 50 Cholesterol: 25 sphingolipids

D: 15 Cholesterol: 30 sphingolipids

The answer is: B

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