1. What are secreted proteoglycans found in the extracellularmatrix?
| a. | they are proteins covalently linked to any polysaccharides |
| b. | they are proteins covalently linked to fibronectin fibrils |
| c. | they are proteins covalently linked to anyoligosaccharides |
| d. | they are proteins covalently linked to collagen fibrils |
| e. | they are proteins covalently linked to glycosaminoglycans |
2. Which of the following signaling molecule is first producedupon activation of olfactory receptor neurons to mediate\"smell\"?
