Word: repressors
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...must be learned about ribosomes." In the 1970 edition, there are twenty pages of new information. There is also new information on specific genetic mutagens, enzymes for genetic mutagens, enzymes for genetic recombination, specific factors to start and stop RNA transcription, new known gene codes, new material on operon-repressor systems, and much more...
...Harvard biologists have won the 1969 George Ledlie prize for their study of "repressor molecules" in cellular genetic function...
...repressor molecules" that Gilbert and Ptashne studied are proteins that stimulate a few of the genes in each living cell and repress the other genes. Since each cell needs only a few of its thousands of genes to be functioning at any one time, the repressors are neces- sary to turn some of the genes on and keep the rest switched...
Scientists had speculated for several years that cells must contain some repressor system, but ptashne and Gilbert were the first to show the existence of the actual protein structures. They conducted separate studies--Gilbert concentrating on bacteris, Ptashne working on viruses- and reported their results...
...UNIVERSE (ABC, 4-5 p.m.). "The Scientist" focuses on Nobel Prizewinner James D. Watson and associates as they examine the repressor molecule that controls hereditary characteristics. Repeat...