A 42-year-old man comes to the physician for a follow-up appointment. He has a 1-year history of sexual dysfunction and difficulty seeing out of his peripheral vision. He has a 1-month history of agitation and tremulousness that worsens between meals. The hormone most likely responsible for this patient’s tremulousness does which of the following?
Decreases glycogen synthesis
Direct activation of serine-threonine kinases
Indirect activation of tyrosine kinases
Increases ubiquitin-mediated proteolysis
Upregulates protein synthesis
