Beginning with protein synthesis in membrane-bound ribosomes, hepatocytes secrete proteins into the circulation via which of the following mechanisms? (A) Active transport through the cell membrane (B) Diffusion through the cell membrane (C) Transport by microtubules and exocytosis (D) Transport in vesicles and exocytosis (E) Transport through pores in the cell membrane
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- In what ways is transport through the nuclear pores selective?Vacuoles are fluid-filled organellespresent in some cells.Which function isNOT normally performed by vacuoles?When the new cell matures, it will be approximately how manytimes greater in volume and how many times greater in surfacearea than its current size?
- Which junctions are cell-to-cell junctions and which arecell-to-ECM junctions?If a sheet of epithelial cells is lining the stomach, what type of cell-cell junction might be present between neighboring epithelial cells to keep the stomach contents from passing between cells?Cancer cells can eventually metastasize (or spread) from their tissue of organ to distant sites throughout the body. Which of the three types of cytoskeletal components could be used to detect the tissue of organ of a metastatic cancer cell? Why? (For example, if you took a biopsy of a tumor that had spread to the lungs, how could use what you know about the cytoskeleton to determine where the cancer originated? )
- How are membrane formed? What composes them?Secretory vesicles fuse with the cell membrane to release their contents to the outside of the cell. In this process, the membrane of the secretory vesicle becomes part of the cell membrane because small pieces of the membrane are continually added to the cell membrane, one would expect the cell membrane to become larger and larger as secretion continues. The cell membrane stays the same size, however. Explain how this happens.What kind of membrane proteins trigger a change in cellular activity in response to a stimulus?