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20 Nov 2019
The histones that form the core of a nucleosome get into the nucleus by which of the following? passive diffusion through nuclear pores selective and facilitated active transport through nuclear pores ribosomes located in the nucleus synthesize histones in the nucleus histones are made at the ER membrane and then diffuse to the nucleus What indicates or signals to the cell that a protein synthesized in the cytoplasm belongs in the nucleus? the way the protein folds the presence of a nuclear localization signal the presence of an ER signal sequence nuclear proteins are synthesized in the nucleus nucleus-specific ribosomes synthesize and transloate nuclear proteins into the nucleus The movement of proteins across the nuclear membrane, through pores, occurs due to? Translation energy generated by the hydrolysis of GTP sodium/potassium concentration gradient importin/exportin concentration gradient Ran-GTP/Ran GDP concentration gradient Membrane proteins that belong in the golgi, lysosome, or plasma membrane are first targeted to which organelle before reaching their final subcellular destination? the golgi apparatus the smooth ER the nucleus the ER membrane the ER lumen Which of the following proteins interacts with importin-Ran-GDP? mitochondrial matrix proteins nuclear matrix proteins lysosomal hydrolases peroxisomal proteins secreted hormones The release of the ERSS, of a lysosomal protein by an SRP, to the ER translocon DOES NOT require energy. True False Ribosomal proteins possess BOTH a nuclear localization signal and a nuclear export signal.? Telomerase Chromosomal scaffolding proteins mRNA carrier proteins DNA polymerase Histone proteins You have created a cell line in which Ran-GAP has been mutated such that it has become NON-functional What would be the long-term impact of the mutaton? this mutation would not alter protein transport across the nuclear membrane this mutation would ultimately prevent nuclear import this mutation would ultimately prevent nuclear export this mutation would ultimately prevent both nuclear import and export this mutation would ultimately prevent cotranslational translocation Why must translation stop (or slow down) upon recognition and binding of the ER signal sequence by SRP? To allow for transfer of the ERSS to the transiocon by SRP SRP does not have the 'strength' to carry a fully synthesized protein To ensure that signal peptidase works correctly To allow translation to drive protein translation across the ER membrane Which specific nuclear structure is critical for the reformation of the nucleus after mitosis? Inner nuclear membrane Nucleolus Chromatin Nuclear lamins Outer nuclear membrane Golgi membrane proteins are transported from the ER to the Golgi via? Clatherin coated vesicles COP-I coated proteins COP-II coated proteins COP-III coated proteins Uncoated vesicles
The histones that form the core of a nucleosome get into the nucleus by which of the following? passive diffusion through nuclear pores selective and facilitated active transport through nuclear pores ribosomes located in the nucleus synthesize histones in the nucleus histones are made at the ER membrane and then diffuse to the nucleus What indicates or signals to the cell that a protein synthesized in the cytoplasm belongs in the nucleus? the way the protein folds the presence of a nuclear localization signal the presence of an ER signal sequence nuclear proteins are synthesized in the nucleus nucleus-specific ribosomes synthesize and transloate nuclear proteins into the nucleus The movement of proteins across the nuclear membrane, through pores, occurs due to? Translation energy generated by the hydrolysis of GTP sodium/potassium concentration gradient importin/exportin concentration gradient Ran-GTP/Ran GDP concentration gradient Membrane proteins that belong in the golgi, lysosome, or plasma membrane are first targeted to which organelle before reaching their final subcellular destination? the golgi apparatus the smooth ER the nucleus the ER membrane the ER lumen Which of the following proteins interacts with importin-Ran-GDP? mitochondrial matrix proteins nuclear matrix proteins lysosomal hydrolases peroxisomal proteins secreted hormones The release of the ERSS, of a lysosomal protein by an SRP, to the ER translocon DOES NOT require energy. True False Ribosomal proteins possess BOTH a nuclear localization signal and a nuclear export signal.? Telomerase Chromosomal scaffolding proteins mRNA carrier proteins DNA polymerase Histone proteins You have created a cell line in which Ran-GAP has been mutated such that it has become NON-functional What would be the long-term impact of the mutaton? this mutation would not alter protein transport across the nuclear membrane this mutation would ultimately prevent nuclear import this mutation would ultimately prevent nuclear export this mutation would ultimately prevent both nuclear import and export this mutation would ultimately prevent cotranslational translocation Why must translation stop (or slow down) upon recognition and binding of the ER signal sequence by SRP? To allow for transfer of the ERSS to the transiocon by SRP SRP does not have the 'strength' to carry a fully synthesized protein To ensure that signal peptidase works correctly To allow translation to drive protein translation across the ER membrane Which specific nuclear structure is critical for the reformation of the nucleus after mitosis? Inner nuclear membrane Nucleolus Chromatin Nuclear lamins Outer nuclear membrane Golgi membrane proteins are transported from the ER to the Golgi via? Clatherin coated vesicles COP-I coated proteins COP-II coated proteins COP-III coated proteins Uncoated vesicles
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