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17. What interaction is involved in the docking of a vesicle to a specific membrane? e Ran-GTP on vesicle binds to receptor on target membrano b. Rob protein on vesicle binds to tethering protein on target membrane c. Rab protein on target membrane binds to tethering protein on vesicle d. Adantin protein fuses the protein coats on the two membranes Cell Signaling 18. When cells respond to an extracellular signal, they most often convert the information from one form to another. This process is called: a signal transformation. b. signal transduction. c. signal interference. d. signal amplification. e signal reception 19. Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by enumber of cells in the immediate vicinity responding? a hormonal signaling b. autocrine signaling c. parncrine signaling d. endocrine sinaling c. synaptic signaling 20. Nitric Oxide can relax blood vessel walls to allow for more blood flow. This signaling mechanism is an example of what? a a parncrine signal that crosses membrane and binds directly to effector protein. b. a paracrine signal that crosses membranes and binds to nuclear recretors . a paracrine signal that binds a cell surface receptor. d. an endocrine signal distributed by the circulatory system. can autocrine signal that binds its own cell surface rector 21. During nervous system development in Drosophila, the membrane-bound protein Delta acts as an inhibitory signal to prevent neighboring cells from developing into neuronal cells. Delta is involved in signaling 2 endocrine b. paracrine C. neuronal d. autocrine c. contact-dependent 22. A slow response to a signal is generally associated with what? . poor affinity between the signal and its receptor. b. a low concentration of the signal c. the signaling results in a change in gene expression d. the signal requires a phosphorylation cascade 23. GTP binding proteins, which act as molecular switches inside cells... A. are active when GTP is bound. B. are active when GDP is bound. C. turn themselves on by converting GTP to form GDP. D. are active only in their trimeric forms.