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By Lawrence S. Dillon

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Extra resources for The Gene: Its Structure, Function, and Evolution

Sample text

Later a derived enzyme (I) transcribes genes for all nontranslated RNAs, including ribosomal, transfer, and the various small RNAs, while the ancestral stock (II) becomes specialized for hnRNAs, most of which are translated into proteins. 3. 8 S subunits of rRNA. It will be of interest to find how closely these preliminary deductions are actually corroborated when the higher bacteria polymerases ultimately receive investigation. 2. TRANSCRIPTION OF tRNA GENES As pointed out in Chapter I, genes no longer can be viewed merely as the series of nucleotide residues that encode a particular polypeptide or functional RNA.

The two controlling proteins A and L, products of nijLA, have opposing roles, the first activating, the second suppressing, transcription of all genes in the operon except their own. In turn, nitrogen-sensitive genes under certain conditions activate transcription of nijLA. The several transcription units that constitute the operon and their polarities are indicated by the small arrows. DKY unit, the nitrogenase enzyme complex that reduces N2 to NH t (McLean and Dixon, 1981). , 1982). Classes of Operons.

1983), upward to around 1000, as in many dispersed repeated elements in Xenopus (Davidson and Britten, 1973), and even to tens of thousands , as in others from the last source. Many of these repeated elements in both prokaryotes and eukaryotes are relatively freely transposable from one region to another. While their true nature is just beginning to be exposed, these elements, under such varied names as transposons , inserted sequences, and transposable elements, are proving to exercise considerable and highly diversified influence on the expression of particular genes .

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