What is the difference between the trithorax (TrxG) and polycomb (PcG) complexes of proteins?
A. TrxG proteins methylate lysine 27 on histone H3 while PcG complexes methylate lysine 4 on H3
B. Methylation of lysine at position 4 on H3 results in silencing of gene expression
C. TrxG complex proteins activate gene expression by methylating lysine 4 on H3, while PcG complex proteins repress gene expression by methylating lysine 27 on H3.
D. Methylation of H3 on lysine 27 can result in activation of transcription
A
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