Exam 5: Membranes

When compared to the solution, the egg that gained weight was ______.

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

What is the net movement of substances to regions of lower concentration called?

The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that

For the process of diffusion to occur, molecules must

To test for the presence of starch, iodine can be used.A positive reaction results in a black color.A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution.After 30 minutes the dialysis bag appears black.Based on this information, what most accurately describes what happened?

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

A phospholipid molecule has a polar and a nonpolar end.Because of this, water molecules form

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

If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called

What initiates the sodium-potassium pump?

One day during the summer you and some friends make ice cream using an electric ice cream maker.To get the ice cream to form, a mixture of salt and ice is packed around the ice cream maker.A few days later you notice a yellow circle of dead grass where the ice cream maker had been placed.You hypothesize that some of the salt and ice mixture spilled onto the grass and ___.

If Na⁺ levels were depleted in the extracellular fluid, rate of glucose movement would

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?

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

Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones.Requirements for facilitated diffusion include

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 symporter is moving glucose and sodium levels are being depleted in extracellular fluids.What can be concluded about the movement of glucose? Choose all that apply.__X__ Glucose would be moving against its gradient into the cell __X__ Glucose follows the gradient of sodium into the cell _____ Glucose would be moving with its gradient into the cell __X__ ATP is not required to move sodium down its concentration gradient __X__ Energy is needed to move glucose down its concentration gradient _____ Glucose's movement would still be considered diffusion __X__ Glucose's movement is considered a part of coupled transport

While eating lobster for dinner one night your friend asks what you think might happen if this marine invertebrate, which is normally isosmotic with respect to the surrounding seawater, were to be moved to a bay with a slightly lower salt concentration instead of being caught.You reply that, in order for the lobster to be isosmotic with respect to new environment,

Red blood cells are bi-concave.Their shape is determined by interior proteins anchored to the membrane termed