1st and 2nd Messenger Systems


Transcription Factors: -Proteins that control which genes are turned on or off at the genome

-They do so by binding to DNA and other proteins

-Once bound to DNA these proteins can promote or block the enzume that controls the transcription of genes

1st and 2nd Messenger Systems: 

(1)Tyrosine Kinase: 

-Hormone binds to domains exposed on the cell's surface

-Results in…


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