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The Protein-tyrosine kinases phosphorylate the ______________ residues.

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The Protein-tyrosine kinases phosphorylate the ______________ residues.

(a) adenine

(b) cytosine

(c) tyrosine

(d) chymosin

The question was posed to me in an online interview.

Origin of the question is Cell Signaling and Signal Transduction in section Cell Signaling and Signal Transduction of Cell Biology

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Correct choice is (c) tyrosine

To explain: The protein-tyrosine kinases are enzymes that add phosphate groups to specific tyrosine residues on the protein substrates. Protein-tyrosine phosphorylation is a mechanism of signal transduction.

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