Er sacs covered protein endoplasmic reticulum? system flattened

Text	What is the endoplasmic reticulum? A system of flattened sacs of membrane continuous with the nuclear envelope There are two types: Rough ER is covered in ribosomes (site of protein synthesis) - protein goes in sacs the small vesicles can break of the ER and transport them to a golgi body Smooth ER not covered in ribosomes. Makes lipids (ex. chloresterold) and steroids

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