The NucleolusOxford University Press, 1971 - 16 pages |
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15 nm granules 18S RNA excess 18S rRNA 28S genes 28S rRNA molecules 60S ribosomal subunits A. J. Dalton active genes anucleolate appearance arrows biochemical evidence Birnstiel block of 18S caesium chloride centrifugation chain chromatin chromo chromosome region consists cytoplasm Dalton and F density distinct band electron micrographs Electron microscopy enzyme excess RNA 28S fibrillar region function g/cm³ gene(s genes are arranged Granboulan granular zone Haguenau Helianthus tuberosus incubated interphase isolated fibrillar zones messenger RNA metabolism microscope Miller and Beatty mRNA nm in diameter nuclear envelope nuclear pores nucleolar chromosome nucleolar organizer nucleolar organizing region nucleolar vacuole nucleolus of Spirogyra polysome precursor rRNA Prophase Protein molecules radioactive rDNA region of fibrils ribo Ribosomal genes ribosomal RNA ribosome precursors RNA 28S RNA RNA excess RNA RNA polymerase rRNA genes secondary constriction spacer DNA Spirogyra sp tadpole threads transfer RNA tuber tissue Ultrastructure in biological Xenopus laevis oocyte