Question

tyrosine kinase receptors are described as specifically phosphorylating tyrosine amino acids. given that a kinase is involved in phosphorylation, what does this specific action imply about the nature of the signal transmission? the signal is being terminated because phosphorylation always deactivates proteins. the signal is being transmitted by chemically changing the internal cellular proteins function. the ligand is now able to enter the nucleus to act as a transcription factor. energy is being released into the cell, which is the definition of a second messenger.

Explanation:

Tyrosine kinase receptors phosphorylate tyrosine amino - acids. Phosphorylation can change a protein's function. In signal transmission, this chemical modification of internal cellular proteins helps transmit the signal. Phosphorylation doesn't always deactivate proteins, ligands usually don't directly enter the nucleus as transcription factors after this phosphorylation event, and phosphorylation isn't about releasing energy as a second - messenger definition.

Answer:

The signal is being transmitted by chemically changing the internal cellular protein's function.