Structural and functional features of the lysosomes include I. internal pH is higher than the cytosol to provide an acidic pH for the enzymes II. single membrane with a hydrogen ion pump to maintain an acidic pH III. filled  with hydrolytic enzymes that are glycosylated IV. its contents are delivered by clathrin-coated vesicles from the TGN     II, III, IV only     I, II, III only     I, II, III, IV     I, II, IV only

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