1. In class we discussed the concept of molecular switches. Which of the following would be FALSE? a) phosphatases remove the phosphate from GTP on GTP-binding proteins, turning them off. b) Protein kinases transfer the terminal phosphate from ATP onto a protein. c) Serine/threonine kinases are the most common types of protein kinase. d) A GTP-binding protein exchanges its bound GDP for GTP to become activated. 2. Which of the following sentences about GABA receptors is FALSE? a)They promote neuronal uptake of Na+. b) they inhibit synaptic signaling. c) they are ligand-gated channels. d) they are located on postsynaptic membranes