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4 / 18  What property enables the residues of the amino acids serine, threonine, and tyrosine to be phosphorylated?
A  They are polar.
B  They are non-polar.
C  They contain a hydroxyl group.
D  They occur more frequently in the amino acid sequence of signaling proteins.

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Source:  OpenStax, Ap biology - part 1: the cell. OpenStax CNX. Oct 02, 2014 Download for free at https://legacy.cnx.org/content/col11711/1.1
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