Question

IS ER bounded with cell membrane​

Answer 1

$\huge{ \mathfrak{answer}}$

No

The endoplasmic reticulum is found in most eukaryotic cells and forms an interconnected network of flattened, membrane-enclosed sacs known as cisternae (in the RER), and tubular structures in the SER.

The membranes of the ER are continuous with the outer nuclear membrane.

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