. Differentiation of the Spemann’s primary organizer requires which of the following?* a.  transcription of nodal by tcf3. b. rotation of the cortex before fertilization. c. inhibition of disheveled protein by GSK3. d. inhibition of GSK3 to increase ß-catenin protein. 2. Which of the following types of induction is NOT exhibited during eye lens differentiation? a. instructive induction b.  community induction c. reciprocal induction d. sequential induction     3. Paracrine signaling is characterized by which of the following?* a.  Inducer and responder are adjacent. b. Evocators diffuse towards receptors. c. Evocators are ligand membrane proteins. d.  membrane channels allow ions to diffuse between cell

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