Which ultrastructural region of a eukaryotic cell is continuous with the perinuclear space and forms an extensive network throughout the cytoplasm?
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Correct answer: Endoplasmic reticulum
The endoplasmic reticulum (ER) is continuous with the perinuclear space of the nuclear envelope and extends throughout the cytoplasm as a network of tubules and cisternae — visible clearly under electron microscopy.
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