BS 161 Chapter 5 Practice Quiz – Flashcards

On the outer surface of the plasma membrane there are marker molecules that identify the cell type. Often these molecules are __________.

While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids permanently into position. Thus, the bilayer is considered to be ____________.

The movement of substances to regions of lower concentration is called ____________.

Osmosis is the diffusion of water across a membrane in response to the concentration of one or more of the ____________.

How are the tails and heads of a membrane phospholipids oriented in their environment?

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, it _____________.

You do an experiment in which you increase the concentration of phosphate in a solution and measure the uptake by plant cells. You find that once the concentration of phosphate reaches 1 gram per liter adding more phosphate does not increase uptake any further. From this you would conclude that phosphate is taken up by ______ .

Cholesterol functions in the plasma membrane to ______________.

If the cell has a normal osmotic pressure of 4500 mmHg and is placed into a solution with an osmotic pressure of 3500 mmHg, what will happen to the cell?

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

The plasma membrane is a thin sheet of lipid embedded with _____________.

When the solute concentration of solute A is lower than the solution concentration of solution B, solution A is considered ______________.

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

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

Carrier-mediated transport is also called ____________.

Membrane fluidity is affected by ________.

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?

Which mutations can interfere with he proper insertion of a protein int he plasma membrane?

The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called ______________.

The fluid nature of the membranes is attributed to a lateral movement of ______________.

If a cell has the same concentration of dissolved molecules as its outside environment, the cell's condition is referred to as being _______________.

Osmosis can only occur if water travels through the ________>

A mixed solution of water and ions is exposed to a cell membrane and allowed to interact for an hour. Which would diffuse across a phospholipid bilayer fastest?

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