Exam 5: Membranes

Choose all that apply.A concentration gradient is exhibited when

The movement of substances from regions where their concentration is higher to regions where their concentration is lower is called

A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour.Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?

Which mutations can interfere with the proper insertion of a protein in the plasma membrane?

If you were to replace the phosphate group of a phospholipid with a fatty acid chain,you would have

How can freeze-fracture be used to determine the orientation of a protein in a membrane?

In the process of diffusion,molecules move from areas where

Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?

In bacteria,fungi,and plants the high internal pressure generated by osmosis is counteracted by the mechanical strength of their

Three (3)eggs are boiled and all weigh 2g.The eggs are placed in a 15% solution of NaCl and reweighed after 30 minutes. McGraw-Hill Education -When compared to the solution,the egg that gained weight was ________.

In individuals with normal blood sugar levels,glucose is reabsorbed into the bloodstream in the kidney by members of the GLUT transporter family,which form an aqueous pore across the membrane through which glucose can move passively.As a result,no glucose is excreted in urine.However,in people with untreated diabetes mellitus,blood sugar levels are high and glucose is often present in the urine.What can explain this occurrence?

In a single sodium-potassium pump cycle,ATP is used with the result that

Membrane proteins serve many functions.One of the functions is transportation of substances across the membrane.If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins,the process that will be affected is

The type of movement of molecules that is specific and passive,and which becomes saturated if all of the protein carriers are in use is

A research laboratory is attempting to collect the content of human red blood cells.The type of solution researchers should use to cause blood cells to lyse (burst)would be

The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its

Turgor pressure is observed when a plant cells environment is ________.

A scientist performs an experiment in which they create an artificial cell with a selectively permeable membrane through which only water can pass.They inject a 5M solution of glucose into the cell and then place the cell into a beaker containing 10M glucose.What effect do you expect to observe?

An individual is constipated.They take magnesium salts to help loosen the stool.Why does this work?

The accumulation of amino acids and sugars in animal cells can occur through