#1

• Which part of all cells is responsible for regulating which substances enter or exit the cell?

• a. cell wall

• b. nuclear membrane

• c. cell membrane

• d. nuclear wall

#2

• Which of the following best describes the cell membrane?

• a. completely permeable

• b. watertight

• c. selectively permeable

• d. protectively permeable

#3

• The transport of materials in and out of a cell helps an organism maintain an internal stability known as…

• a. facilitation

• b. fermentation

• c. differentiation

• d. homeostasis

#4

• All forms of passive transport are driven by…

• a. energy from the cell in the form of ATP

• b. ion channels

• c. the kinetic energy of molecules

• d. carrier proteins

#5

• If the molecular concentration of a substance is the same throughout a space, the substance…

• a. has a large concentration gradient

• b. is in equilibrium

• c. has a small concentration gradient

• d. will undergo active transport

#6

• Which of the following is NOT a factor used to determine the ability of a molecule to diffuse across the cell?

• a. size

• b. solubility

• c. type

• d. all are factors used

#7

• Which of the following substances can pass through the cell by diffusion?

• a. sodium ions

• b. chlorine ions

• c. glucose

• d. oxygen

#8

• The diffusion of water is called…

• a. facilitated diffusion

• b. diffusion through ion channels

• c. osmosis

• d. simple diffusion

#9

• For the following, determine if the statement is referring to a HYPOTONIC, HYPERTONIC, OR ISOTONIC solution.

• It’s prefix means “the same” • Occurs when concentration of solutes

outside the cell is lower than in the cytosol

• Water moves out & the cell shrinks in this type of solution

#10

• For the following, determine if the statement is referring to a HYPOTONIC, HYPERTONIC, OR ISOTONIC solution

• Water diffuses in and out at equal rates & cell remains the same size in this type of solution

• It’s prefix means “less” • Occurs when the concentration of

solutes outside the cell is higher than in the cytosol

#11

• For the following, determine if the statement is referring to a HYPOTONIC, HYPERTONIC, OR ISOTONIC solution

• It’s prefix means “more” • Water moves in & cell gets larger in this

type of solution • Occurs when the concentration of solutes

outside the cell is equal to the concentration of solutes inside the cell

#12

• A structure that can remove excess water from unicellular organisms in hypotonic environments is called…

• a. carrier protein

• b. contractile vacuole

• c. ion channel

• d. solute pump

#13

• Plants cells are often found in hypotonic environments. The influx of water causes the plant cell to swell, exerting pressure the cell wall. This pressure is called…

• a. wall pressure• b. membrane pressure• c. botanic pressure• d. turgor pressure

#14

• When a human red blood cell is placed in a hypotonic environment, it will

• a. undergo cytolysis

• b. be at equilibrium

• c. undergo plasmolysis

• d. shrink

#15

• Which of the following is NOT a characteristic of facilitated diffusion?

a. Requires energy

b. Moves substances down a concentration gradient

c. It requires no energy input

d. It involves a change in the shape of its carrier

#16

• Facilitated diffusion is often used to transport…

• a. molecules too small to diffuse

• b. water

• c. molecules not soluble in lipids

• d. ions

#17

• Na+ ions enter cells by

• a. diffusion

• b. facilitated diffusion

• c. osmosis

• d. diffusion through ion channels

#18

• Which of the following is NOT an example of ACTIVE transport?

• a. facilitated diffusion

• b. endocytosis

• c. exocytosis

• d. cell membrane pumps

#19

• Cell membrane pumps refers to carrier proteins involved in which type of transport?

• a. passive

• b. active

• c. simple

• d. aggressive

#20

• The sodium-potassium pump creates an electrical gradient by placing _____ Na+ outside the cell membrane and _____ K+ inside the cytosol.

• a. 2; 3

• b. 3; 2

• c. 6; 9

• d. 9; 6

#21

• Molecules that are too large or fluids can be moved through the membrane and transported by…

• a. osmosis

• b. lipid carriers

• c. ion channels

• d. endocytosis

#22

• Pinocytosis and phagocytosis differ in that….

a. One is a passive transport, while the other is an active transport mechanism

b. One is a type of exocytosis, while the other is a type of endocytosis

c. One transports fluids, while the other transports solid particles

d. One is a type of facilitated diffusion, while the other is a membrane pump

#23

• Cells in animals that ingest bacteria and viruses that invade the body are called…

• a. phagocytes

• b. leukocytes

• c. lysosomes

• d. vesicles

#24

• Ridding the cell of material by discharging it from sacs at the cell surface is called…

• a. phagocytosis

• b. exocytosis

• c. pinocytosis

• d. endocytosis

#25

• Describe the differences between active and passive transport. Discuss both energy requirements and movement relative to the concentration gradient.

#26

• Explain in terms of osmosis, why you should not drink salt water if you are stranded out at sea.

#27

• Arrange the 6 steps of the sodium-potassium pump in order. Then describe each step in words.