The neuron membrane includes a lipid bilayer. channel proteins. signal proteins. all of the above both A and B

Left Compartment                                        Right Compartment 7 grams of Z per liter solution                    4 grams of XY per liter of solution total volume = 1 liter                                    total volume = 1 liter Solute Z  has a molecular weight of 20 (non-dissociable) Solute XY has a molecular weight of 10 (dissociates into X+ and Y-) If X+ and Y- are ions, which are permeable through the membrane, and Z is not, what will happen and why?

Which of the following stimulus or stimuli may cause protein channels involved in membrane transport to open or close:     Change of voltage across the membrane.     Mechanical stress.     Ligand binding.     All of the above.     None of the above.

A biochemist performed a subcellular fractionion ( a separation of cell organelles) and them run TLC to measure the relative presense of defererent lipids. In one fraction there was an absence of cholesterol. What fraction was it? O plasma membrane O cytoplasm O lysosome mitochondria O nucleus

What is the correct rank the following molecules in regards to membrane permeability from MOST (1) to LEAST (4) permeable ? Each number can be used only once. Na+ (sodium ion) [ Choose ] [Choose] CO2 (carbon dioxide) 1 4 Glucose 2 H20 (water) [Choose]

Which structure is at a different level of organization from the other three? O liver O kidney O heart O ciliated cell

A solution of water and dissolved ions is separated by a selectively permeable membrane that allows the passage of water but not small ions. The concentration of sodium is higher on one side of the membrane than onthe other side. However, there is no net movement of water across the membrane. How is this possible?

How would you define the term "membrane potential." The ability of a cell to perform its specialized function. A voltage difference that exists across the outer and inner face of the plasma membrane. The possibility of a given cell activity being accomplished. Aa

Which of the following molecules can freely diffuse across the membrane? Glucose None of these Water K+ ions

How are channel proteins different from carrier proteins? Carrier proteins are more specific than channel proteins Channel proteins allow more rapid movement of substances across the membrane than do carrier proteins O Channel proteins are less specific than carrier proteins Carrier proteins require more time for diffusion to occur than to channel proteins All of these answers are correct