Why do cells need transport proteins? (b) Why can’t components just diffuse through the membrane bi-layer? (C) Why do some forms of transport require ATP to drive transport whereas others do not? Please describe the details for (a), (b), and (c). (15 points) 2. Cell signaling can occur through secreted molecules. (10 points) (a) What is the name of local signaling which occurs through secreted molecules? (b) What is the name of long-distance signaling which occurs through secreted molecules? 3. Describe the three stages of cell signaling: Reception, Transduction, and Response. (15 points)Why Do Cells Need Transport Proteins
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