Question

Question 2 1 pts The circle shown below is a simplified version of a cell, enclosed in a biological plasma membrane. Assume that nothing else is present other than water, protons, this lipid bilayer, and the following: • Object "W" is a transmembrane protein that only transports protons (H'). • ObjectQ is a aquaporin channel. • "P" is a polypeptide. What could happen with regard to W, Q, and P? 11 11 z HO W could transport protons and P could not exit the cell ) into or out of the cell, Q could allow the passage of H2O into or out of the W could transport H2O into or out of the cell P could exit the cell could allow the passage of protons into or out of the cell and W could transport protons or water into or out of the cell or out of the cell and P could exit the cell could allow the passage of 20 or protons into W could transport the polypeptide out of the cell and could allow the passage of H2O into or out of the cell it is impossible to predict what could happen with regard to W., and P

Answer 1

Answer to the above question is option (D) W could transport the polypeptide out of the cell and Q could allow the passage of water in and outside of the cell.

W is a tranasmembrane protien that is known to help the movement of ions, small molecules and substances across the biological membrane. Transmembranes span the entire width of the lipid bilayer and hance has both hydrophobic and hydrophilic ends. This could help the polypedtides to cross the layer as a single alpha helix structure. Had W not been any other membrane and not a transmembrane it woupld not have been possible for the protiens to enter the hydrophobic part of the lipid bilayer but now since it is a transmembrane, it could help in the transportation of the P outside of the cell

while

Q which is an aquapoirin is known to selectively conduct water moleicules in and out of the cell, while preventing the passage of ions and other solutes. Therefore they are also known as water channels.

and

P are the polypeptides meaning long chains of amino acids inside the cell. And since it has a polarity ( alpha amino acid on one end and alpha carboxyl on the other) it could be transported out of the cell with the help of a transmembrane across the lipid bilayer.