Question

The plasma membrane of E. coli is approximately 75% protein and 25% phospholipid by weight. It is known that the average membrane protein molecular weight is 50,000 Da and an average membrane phospholipid molecular weight is 750 Da. Calculate the number of membrane phospholipid molecules present per molecule of membrane protein number of membrane phospholipid molecules: 0.033 molecules Select the additional information that one would need to calculate the fraction of membrane surface covered by phospholipids. the average cross-sectional areas of a 50,000 Da protein and a 750 Da phospholipid in a bilayer the number of moles of protein and phospholipid in the membrane the surface area of the E. coli cell the average densities of a 50,000 Da protein and a 750 Da phospholipid O O

Answer 1

OH2 NI 11|N N ОН, Octahedral Geometry. sp dHybridization. u = 3.30 uß Square Planar Geometry. dsp Hybridization. u = 0 uß

As it already pointed out, I Da means of g/mol. so, membanne protein has weight of 50,000g/mol. membrane photo phospholipid has weight of 750g/mol. If we assume the weight of plasma membrane to be loogram. - Weight of protein = ir gram Weight of phospholipid = 25 gram so, number of protein molecules: 75150,000 - 0.0015 Number of phospholipid molecules : 251750 in 0.033 Ratio - 010333 0.0015 : 22.2 to calculate the fraction of membrane surface covered by the phospholipid. we need to know the average cross sectional areas of a 50,000 Da protein and 750 Da phaspholipid in a bilayer so, Ang is Al