SER mainly consists of
(1) Cisternae and tubules
(2) Cisternae and vesicles
(3) Vesicles only
(4) Tubules and vesicles

Dear student,

The endoplasmic reticulum (ER) is formed of a vast network of membrane-bound tubes and sheets. It looks like round or
oblong bags (vesicles) or long tubules. The ER is of two type- Smooth endoplasmic reticulum (SER), and Rough endoplasmic reticulum (RER). The ribosomes are found attached to the surface of RER. However, ribosomes are not found on the surface of SER.

The RER mostly exists as cisternae while SER often in the form of tubules and vesicles remain isolated in the cytoplasm.
Therefore, the correct answer is 4.

Regards,

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<4>. Tubules and Vesicles
I hope m correct!
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