Because lysosomes differ in shape and size, they are difficult to recognise. Which statement describes a lysosome?
- Aa vesicle containing enzymes, enclosed by a double membrane, that is budded off the endoplasmic reticulum
- Ba vesicle containing hydrolytic enzymes and surrounded by a single membrane, found only in phagocytes
- Ca vesicle enclosed by a single membrane, containing several different hydrolytic enzymes that may act inside or outside the cell
- Da vesicle surrounded by a double membrane, containing enzymes which can hydrolyse damaged organelles in a cell