Lab 3 Pre-quiz

Question 1

Passive transport

Answer 1

substances pass through the plasma membranes without requiring cellular energy

Question 2

Active transport

Answer 2

the cell provides energy in the form of ATP to move substances across the membrane

Question 3

Diffusion

Answer 3

The movement of a substance from a region of high concentration to a region of low concentration

Question 4

Investagating factors affecting diffusion of molecules in agar
-what are we trying to discover

Answer 4

would dyes that are larger in molecular size move faster in the agar or would smaller molecules

Question 5

Diffusion of molecules through dialysis

-what are we trying to discover

Answer 5

• How does the size of a molecule affect its ability to pass through the dialysis sac pores
• Would a molecule pass through that is larger or smaller than the pore size?
• Which would pass through more quickly, an intermediate size molecule smaller than the pore size or a very small molecule?

Question 6

Osmosis

Answer 6

The movement of water through a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration

Question 7

Osmosis in an egg

-what are we trying to discover

Answer 7

The osmolarity of the extra cellular fluids bathing cells affects water movement into and out of cells thereby influencing cell size and shape

Question 8

Isotonic

Answer 8

a solution that has the same concentration of solutes as plasma
-cells in an isotonic solution have the same concentration of solutes and water inside and outside

Question 9

Hypotonic

Answer 9

a solution that has a lower concentration of solutes than plasma

• have a greater concentration of water than plasma
• the cell will swell and can burst (hemolysis)

Question 10

Hypertonic

Answer 10

a solution that has a higher concentration of solutes than plasma

• have a lower concentration of water than plasma
• cells will shrink (crenation)