Which statements are true? Explain why or why not.
1. Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane.
2. Whereas all the carbohydrate in the plasma membrane faces outward on the external surface of the cell, allthe carbohydrate on internal membranes faces toward the cytosol.
3. Although membrane domains with different protein compositions are well known, there are at present no examples of membrane domains that differ in lipid composition.
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Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane.
2. Whereas all the carbohydrate in the plasma membrane faces outward on the external surface of the cell, allthe carbohydrate on internal membranes faces toward the cytosol.
3. Although membrane domains with different protein compositions are well known, there are at present no examples of membrane domains that differ in lipid composition.
Explanation:
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