Question 2 (Mandatory) (0.25 points) Neurotransmitters are stored in bags of the same fat as seen on the cell membrane. These "bags" are called Transporters Protein kinase A Vesicles V-SNARES
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A class of chemicals called neurotransmitters is important in the transmission of nerve impulses. Neurotransmitters are packaged by the cell into small, membrane-bound sacs called vesicles. Upon receiving a chemical signal, the vesicles move towards the cell membrane and fuse with it, releasing the enclosed neurotransmitters from the terminal end of the nerve cell. Which organelle is most likely responsible for packaging neurotransmitters into a vesicle?
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Josee P.
(d) Golgi → lysosome → plasma membrane 24. Which pair of proteins helps vesicles dock at their target membranes? (a) dynamin/clathrin (c) v-SNARE/t-SNARE (b) adaptin/clathrin (d) SRP/SRP receptor 25. Which of the following is not required for protein transport into the mitochondria? (a) signal sequence (c) import receptor (b) Ran GTPase (d) protein translocator 26. The protein required for vesicles to pinch off from the parent membrane is (a) adaptin (c) clathrin (b) dynamin (d) flippase 27. In which cellular location would you expect to find ribosomes translating mRNAs that encode ribosomal proteins? (a) in the nucleus (c) on the rough ER (b) in the cytosol (d) in the lumen of the ER 28. The Na+ channel involved in transmitting neuronal signal along axon is (a) ligand-gated (c) Stress-gated (b) voltage-gated (d) none of the above 29. The Na+-K+ pump is an example of which of the following? (a) uniport (c) antiport (b) symport (d) none of the above 34. The resting membrane potential for most animal cells is 0 mV (a) true (b) false 35. The Na+-K+ pump is responsible for maintaining the high extracellular Na+ concentration and the high intracellular K+ concentration. (a) true (b) false 36. Proteins that are misfolded are degraded in the ER lumen (a) true (b) false 37. Most proteins destined to enter the endoplasmic reticulum begin to cross the membrane while still being synthesized. (a) true (b) false 38. Some of the proteins in the lumen of the ER can end up in the plasma membrane. (a) true (b) false 39. Signal sequences that direct proteins to the correct compartment are encoded in the amino acid sequence and sufficient for targeting a protein to its correct destination. (a) true (b) false 40. Proteins that are translated in the cytosol and lack a sorting signal will end up in the cytosol. (a) true (b) false
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