33. Communication and material exchange between plant cells primarily occur through plasmodesmata. The tubular structure running through the center of a plasmodesma is called a "desmotubule". It is an extension of the membrane of which organelle?
(A) Golgi apparatus
(B) Rough endoplasmic reticulum
(C) Smooth endoplasmic reticulum
(D) Vacuolar membrane (Tonoplast)

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