BIOD 101 Module 5 Exam Portage learning

Question 1 4 / 4 pts Multiple Choice: Which of the following signaling types occurs during periods of development specifically for the secretion of growth factors? Autocrine signaling Endocrine signaling Direct cell-to-cell signaling Correct! Paracrine signaling Synaptic signaling Question 2 4 / 4 pts Explain why a steroid hormone would require a carrier protein to transport it through the bloodstream. Answer: Steroid hormones are hydrophobic. They would require a carrier protein to carry it through the blood because it is considered hydrophilic. Question 3 4 / 4 pts Each of the following is true regarding cellular receptors except: Receptors in each family are classified by structural and functional similarities. Most receptors are located on the outside of a cell, anchored in the plasma membrane. Cell surface receptors contain an extracellular region, an intracellular region, and a hydrophobic region in the plasma membrane. Correct! Intracellular receptors are located in the plasma membrane. they are located in the cell’s cytoplasm or in the nucleus. (See section 5.1 in the module) Question 4 4 / 4 pts What is a ligand? What is its role in cellular signaling? Answer: A ligand is a molecule that has specificity for a given receptor, and the binding of a ligand to the given receptor causes a change. Question 5 4 / 4 pts Fill in the blank: