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2010-06-18 01:57:33

Gene expression takes place in two stages: the transcription of DNA to RNA by an enzyme called RNA polymerase, followed by the translation of this RNA into proteins, whose behavior affects the characteristics of each individual. Transcription: a mechanism controlled in time and space Transcription involves about fifty regulatory molecules that interact with each other to begin reading the gene at the right place and the right time. The slightest irregularity of one of these molecules disturbs...

2005-08-16 14:57:14

New Haven, Conn. -- Biologists testing a mathematical model of the mechanism birds use to control the growth of complex feathers found that plumed feather structures involve the coordination of at least two genes that activate and that inhibit barb growth. "Understanding these mechanisms of feather growth gives a whole new perspective on the unique beauty of feathers," said Richard Prum, senior author on the study. Prum is the William Robertson Coe Professor of Ornithology, and Curator of...


Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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