AP Biology Lesson 5 Quiz

Which of the following forms of cell membrane transport does not require a protein? -contransport -simple diffusion -facilitated diffusion -active transport

active transport NOTE: active transport requires a protein because the material being transported is moving against its concentration gradient

Which part of the plasma membrane contributes the most to the fluidity of the membrane?

cholesterol

A student places a starch and water solution into a bag of dialysis tubing and then ties off the ends. Next he places the filled bag into a beaker of distilled water. Water will not __________ the bag by the process of __________.

enter; diffusion NOTE: diffusion does not occur across a membrane (the dialysis tubing)

During passive transport a molecule can move from an area of __________ concentration to an area of __________ concentration

high; low

Which of the following statements about the plasma membrane is NOT true? -it is made up of phospholipids, cholesterol, integral proteins, peripheral proteins, and glycolipids -it is hydrophilic in the center layer of hydrophobic on the outsides -it is often referred to as a fluid mosaic because its parts are flexible and move past one another -it mainly consists of a phospholipid bilayer with proteins and cholesterol wedges into it

it is hydrophilic in the center layer and hydrophobic on the outsides

What is turgor?

it is pressure on the inside of the plant cell walls

When water moves through cell membranes how much energy is required?

none

Cell membranes fold in order to

participate in active transport of substances

Which transport mechanism can bring an entire cell into another cell?

phagocytosis

Which of the following forms of endocytosis occurs when the plasma membrane pinches inward to bring in materials from outside the cell?

receptor-mediated endocytosis NOTE: this type of endocytosis requires a specific trigger and only brings in a certain type of molecule

Solution A and solution B are separated by a selectively permeable membrane. Solution A is hypertonic with respect to solution B. Which of the statements below does NOT agree with this information?

solute wants to move from solution B into solution A but is stopped by the membrane

What does solution potential measure?

the ability of a solute to be dissolved by water

In the formula for solute potential, what does the C represent?

the molarity of the solute

If a red blood cell were placed in a beaker of distilled water which of the following would occur?

the red blood cell would swell up

Matching: Each answer must be used one, more than, once, or not at all -1 requires the input of energy in the form of ATP -2 the movement of water through a semipermeable membrane from an area where water is highly concentrated to an area where the water is less concentrated -3 the movement of solutes across a membrane from an area where they are less concentrated to an area where they are more concentrated -4 the random movement of particles from an area of higher concentration to an area of lower concentration -A active transport -B bulk flow -C osmosis -D diffusion

1=A 2=C 3=C 4=D

In the sodium-potassium pump __________ molecules of sodium are moved for every __________ molecules of potassium.

3; 2 NOTE: sodium-potassium pumps are specifically shaped to hold 3 sodium molecules and 2 potassium molecules. this ratio does not fluctuate and if there is not enough of either molecule then the exchange will not occur