Cell Signaling 2

What is the main function of intracellular signaling proteins?

• To toggle between active and inactive states

• To activate GTP-binding proteins

• To phosphorylate other proteins

• To open ion channels

Which class of switch proteins are activated or inactivated by phosphorylation?

• GTP-binding proteins

• Ion-channel-coupled receptors

• Enzyme-coupled receptors

• Protein kinases

What is the role of GTP-binding proteins in intracellular signaling pathways?

• To activate protein kinases

• To open ion channels

• To toggle between active and inactive states

• To phosphorylate other proteins

Which class of cell-surface receptors changes the permeability of the plasma membrane to selected ions?

• Ion-channel-coupled receptors

• G-protein-coupled receptors

• Enzyme-coupled receptors

• Protein kinases

What is the main function of G-protein-coupled receptors?

• To activate protein kinases

• To open ion channels

• To toggle between active and inactive states

• To activate GTP-binding proteins

Which enzyme is activated by G proteins to produce cyclic AMP?

• Adenylyl cyclase

• Phospholipase C

• Phosphodiesterase

• GTPase

What is the role of cyclic AMP in intracellular signaling?

• To activate protein kinases

• To open ion channels

• To toggle between active and inactive states

• To phosphorylate other proteins

Which enzyme is activated by cyclic AMP to break down glycogen?

• Adenylyl cyclase

• Phospholipase C

• Phosphorylase kinase

• Glycogen phosphorylase

What is the main function of phosphorylase kinase?

• To activate protein kinases

• To open ion channels

• To toggle between active and inactive states

• To phosphorylate other proteins

Which small messenger molecule is generated by phospholipase C?

• Cyclic AMP

• Inositol trisphosphate

• Diacylglycerol

• GTP