Figure 224

Electron micrograph of the rER and polyribosome complexes. This image shows a small section of the rER adjacent to the nucleus sectioned in two planes. The reticulum has turned within the section. Thus, in the upper right and left, the membranes of the reticulum have been cut at a right angle to their surface. In the center, the reticulum has twisted and is shown as in an aerial view (from above the membrane). The large spiral cytoplasmic assemblies (arrows) are chains of ribosomes that form polyribosomes that are actively engaged in translation of the mRNA molecule. x38,000.

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