Deck 6: Movement Across Plasma Membranes

Question 1

All of the following are found associated with the cell membrane EXCEPT ________.

A) channel proteins
B) phospholipids
C) carrier proteins
D) all of the above

Answer 1

D

Question 2

The ________ the solute concentration, the ________ the osmotic pressure of the solution

A) lesser; greater
B) greater; lesser
C) greater; greater
D) none of the above

Answer 2

C

Question 3

________ is the net movement of water through a selectively permeable membrane, from a region of greater water concentration to a region of lesser water concentration.

A) Diffusion
B) Active transport
C) Osmosis
D) none of the above

Answer 3

C

Question 4

Small molecules, such as water and many ions, cross the membrane without assistance from the cell. This movement is called ________ and requires NO energy expenditure by the cell.

A) passive transport
B) facilitated diffusion
C) active transport
D) none of the above

Question 5

Which of the following describes the plasma membrane?

A) a single layer of phospholipids forms the membrane
B) a double layer of protein forms the membrane
C) the membrane is made up of cristae
D) a bilayer of phospholipids forms the membrane

Question 6

Passive membrane transport processes include ________.

A) consumption of ATP
B) movement of water from a low concentration to an area of high concentration.
C) movement of a substance up its concentration gradient
D) movement of a substance down its concentration gradient

Question 7

Which of the following CANNOT diffuse through the plasma membrane?

A) lipid-soluble molecules
B) water-soluble ions
C) proteins
D) water

Question 8

________ is the net movement of substances from a region of greater concentration to a region of lesser concentration.

A) Osmosis
B) Diffusion
C) Hypertonicity
D) None of the above

Question 9

All of the following are guidelines for cleaning the oil-immersion lens EXCEPT which statement?

A) Use a lens tissue to wipe the oil off the lens.
B) Use the coarse focus knob and move the objective lens away from the slide to create a working space for cleaning.
C) Place a drop of lens-cleaning solution on the paper and completely remove any remaining oil.
D) Use a paper towel to wipe the oil off the lens.

Question 10

________ is motion that causes molecules in gases and liquids to bump into adjacent molecules.

A) Diffusion
B) Brownian movement
C) Osmosis
D) Concentration gradient

Question 11

All of the following are guidelines for using the oil-immersion lens EXCEPT which statement?

A) Once the oil is applied and the oil-immersion objective lens is moved in place, focus the lens with the fine focus knob.
B) Once the oil-immersion lens is in place, swing the objective away from the slide and add a small drop of oil.
C) Place the slide on the microscope and focus first on low power, then medium and the high dry magnifications.
D) Once your slide is in position place a drop of oil on the slide and focus first at low power.

Question 12

Which of the following statements is correct regarding diffusion?

A) The higher the temperature, the slower the diffusion rate.
B) Temperature does not affect diffusion.
C) Molecular weight of a substance does not affect diffusion.
D) The greater the concentration gradient, the faster the rate.

Question 13

In a 10 percent aqueous solution of some salt, the salt is the solute and occupies 10 percent of the solution volume; the solvent-water-makes up the remaining ________ percent of the solution volume.

A) 90
B) 95
C) 10
D) 50

Question 14

Two solutions are separated by a semipermeable membrane with the same properties as a cell membrane. Solution A is a 5 percent salt and solution B is 10 percent salt. Under these conditions, which of the following would most likely occur?

A) Water will move from solution B to solution A.
B) Glucose will move from solution A to solution B.
C) Water will move from solution A to solution B.
D) Glucose will move from solution B to solution A.

Question 15

In a 2 percent aqueous solution of some salt, water makes up the remaining ________ percent.

A) 2
B) 90
C) 100
D) 98