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Which molecules don’t cross nuclear membrane
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Nuclear pores are made up of a group of proteins that are collectively called the nuclear pore complex
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Ch 7 BIOOOo

QuestionAnswer
Which molecules don’t cross nuclear membrane DNA
Nuclear pores are made up of a group of proteins that are collectively called the nuclear pore complex T
Molecules pass into and out of the nucleus through nuclear pores T
The nuclear envelope is composed of two lipid bilayers T
The nuclear envelope is continuous with the Golgi apparatus F
True or false? Large proteins containing a nuclear localization signal (NLS) bind to the nuclear pore and enter the nucleus without any expenditure of energy F
A small protein (molecular weight = 25,000 daltons) is injected into a cell and observed in the nucleus a short time later What type of transport has taken place? passive transport
In experiments to test whether a protein can enter the nucleus, why would proteins be labeled with fluorescent molecules? To make the proteins easy to see
Nucleoplasmin is a nuclear protein, This protein was divided into two segments and linked to the same large cytoplasmic protein, generating two fusion proteins, After injecting these fusion proteins into a cell, one of the proteins was found in the nucleu Only one of the two fusion proteins possesses a nuclear localization signal.
Molecules move into and out of the nucleus through the _____ nuclear pore complexes
Which organelle plays a role in intracellular digestion? Lysosome
Which statement most accurately describes what happens to proteins that lack an ER signal sequence? They are released into the cytosol
How are proteins transported throughout the endomembrane system? The protein contains a molecular zip code that allows the protein to be shipped to the correct cellular compartment
Pinocytosis the cell is engulfing extracellular fluid
What three distinct elements make up the cytoskeleton in eukaryotic cells? actin filaments, intermediate filaments, and microtubules
Which of the following would enable you to identify the plus end of actin filaments? Add radiolabeled actin subunits to a mixture of actin filaments in which conditions are favorable for polymerization.
Common evolutionary origin for pro and eukaryotic flagella. Eukaryotic flagella undergo an undulating motion and are covered by a plasma membrane; prokaryotic flagella move by rotating and lack a plasma membrane.
Cellular homogenization is often incomplete, and the mixture has unbroken cells that are found in pellet 1 (nuclei and whole cells)
Histones (proteins) are found in first pellet
The preparation of liver mitochondrial enzymes begins by placing liver and a buffered solution in a blender.What is the purpose of the blender? to prepare a cell homogenate; to break open the liver cells and to release the organelles
Created by: kbaalman
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