Abstract
The fate of cytoplasmic membranes was followed in amebae treated with actinomycin D. Samples were prepared for electron microscopy daily for five days. Untreated cells contained multiple Golgi bodies $ ̃ 1 μ in diameter, and both tubules and short cisternae of granular endoplasmic reticulum 500–2000 Å wide. After three to 4 days of actinomycin treatment, the number and size of Golgi bodies were decreased. In addition, the granular endoplasmic reticulum formed cisternae that were both longer and narrower than those found in untreated cells. Some of these cisternae partially or completely encircled areas of cytoplasm. The results are compared with those obtained following surgical enucleation of amebae [1]. The possibility that RNA synthesized in the nucleus is important in maintaining the usual form of the Golgi apparatus and endoplasmic reticulum is discussed.
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