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Which of the following mechanisms is NOT responsible for phosphoglyceride and cholesterol localization and movement within...

Which of the following mechanisms is NOT responsible for phosphoglyceride and cholesterol localization and movement within the cell?
protein-directed membrane contact between organelles
vesicle transport
biosynthesis in distinct organelles
lipid transfer protein–mediated exchange between membranes
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Answer #1

Option 3rd is the correct answer. Biosynthesis of lipids occurs only in endoplasmic reticulum (ER) because the enzymes responsible for synthesis of lipid are found in ER. The lipids (either phosphoglycerides or cholesterol) synthesized in ER are transported to their destination via golgi apparatus and lysosome through the formation of budd (vesicles) with the help of cargo proteins and thus, option 1st, 2nd and 4th are correct mechanism for lipid movement within the cell.

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