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分子生物學小考(一) 範圍ch3~ch7
分子生物學小考(一) 範圍ch3~ch7

... 6. The genetic code is said to be degenerate. This means, that (A) each codon codes for more than one amino acid (B) each anticodon can interact with many different triplet sequences in the mRNA (C) many of the amino acids are coded for by different codons (D) the code is universally used by virtual ...
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... • A  non-­‐coding  RNA  called  tRNA  folds  into  itself  into  a  complex  3D-­‐structure.   It  has  an  anti-­‐codon  that  pairs  with  the  reverse  complement  codon  in  the   mRNA  and  releases  the  correct  amino  acid   ...
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JAK/STAT signalling • Binding of cytokines (small protein ligands) to

... Cells  that  communicate  with  each  other  electrically  through  synapses   An  amino  acid  that  is  often  a  target  for  kinases   Ligands  bind  to  these   Created  by  the  association  of  two  proteins   ...
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Transcription Control in Eukaryotes

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... cAMP receptor protein (CAP), acting as a homodimer can bind both cAMP and DNA. When glucose is absent (high cAMP state), CAP binds to its positive regulatory element increasing transcription of the lac operon 50-fold. Lac repressor is a tetrameric complex that in the absence of lactose binds tightly ...
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Transcription factor



In molecular biology and genetics, a transcription factor (sometimes called a sequence-specific DNA-binding factor) is a protein that binds to specific DNA sequences, thereby controlling the rate of transcription of genetic information from DNA to messenger RNA. Transcription factors perform this function alone or with other proteins in a complex, by promoting (as an activator), or blocking (as a repressor) the recruitment of RNA polymerase (the enzyme that performs the transcription of genetic information from DNA to RNA) to specific genes.A defining feature of transcription factors is that they contain one or more DNA-binding domains (DBDs), which attach to specific sequences of DNA adjacent to the genes that they regulate. Additional proteins such as coactivators, chromatin remodelers, histone acetylases, deacetylases, kinases, and methylases, while also playing crucial roles in gene regulation, lack DNA-binding domains, and, therefore, are not classified as transcription factors.
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