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- When can gelatin be used in culture media preparation? [Answer in not more than 2 sentences]Explain the differences between gel electrophoresis and column chromatography. Address the principles behind each separation. Why do large molecules migrate more easily in one method and with more difficulty in the other? Which method generated the most precise results?write a short not on insoluble polymer matrix system of modified dosage form. question is related to pharmaceutical subject so this question accordingly.