7.) In receptor-mediated endocytosis, the receptor molecules are initially present on the outside of the cell. Where do they end up after endocytosis? (look at a picture of the process to help you) A. on the outside of vesicles B. on the inside surface of the cell membrane C. on the inside surface of the vesicle D. on the outer surface of the nucleus E. on the ER
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Which of the following is true regarding receptor-mediated endocytosis? a) All of these choices. b) none of the choices are correct c) A ligand binds specifically with a receptor on the extracellular surface of the plasma membrane. d) Some transport vesicles fuse with a lysosome, which essentially breaks down the contents. e) Vesicles transport receptors back to the plasma membrane.
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Place in order the following events of receptor-mediated endocytosis. (1) Clathrin coat disappears. (2) Receptors collect in a coated pit covered with clathrin on the cytoplasmic side. (3) Receptors recognize and bind specific molecules. (4) Endocytic vesicle may fuse with lysosome whereas receptors are recycled to the cell surface. (5) Pits deepen and pinch free of plasma membrane to form endocytic vesicles. a. $ 4,1,2,5,3$ b. $ 2,1,3,5,4$ c. $ 3,2,5,1,4$ d. $ 4,1,5,2,3$ e. $ 3,1,2,4,5$
Vesicles form in ___________. a. endocytosis b. exocytosis c. phagocytosis d. all of the above
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