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Partial Credit
Three examples of passive transport mechanisms are [_______________], [______], and [________________].


simple diffusion
osmosis
facilitated diffusion

1

A cell is immersed in a beaker of solution. The cell membrane is permeable to water but impermeable to solutes. If the intracellular concentration is 10 mM and the solution is 20 mM, which of the following is true?

The cell will shrink.

2

Activity 1: In this activity, the solutes were transported through the dialysis membrane by _______.

simple diffusion

3

Refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which of the following passed through the 20 MWCO membrane?

Water

4

Refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which of the following passed through the 100 MWCO membrane?

Na+and urea

5

Activity 2: What is the type of transport supplied by the glucose carriers in the activity?

facilitated diffusion

6

Refer to Activity 2: Simulated Facilitated Diffusion. Which solute(s) were able to travel against their concentration gradients?

None were able to travel against the concentration gradient

7

Refer to Activity 2: One way that the rate of glucose transport could be increased is:

Increase the concentration of glucose

8

Activity 2: Which of the following would decrease the rate of facilitated diffusion?

Decreasing the number of carrier proteins

9

Refer to Activity 3: Simulating Osmotic Pressure- Under which type of transport process is osmosis included?

Simple diffusion

10

Refer to Activity 3: Which of the membranes excluded NaCl movement through the membrane?

20 MWCO

11

Activity 3: With the experimental conditions set at the 200 MWCO membrane in place, 10 mM glucose and 9 mM albumin, which of the following is true?

The net movement of water is toward the albumin.

12

Activity 3: Which of the following generated osmotic pressure?

Sodium chloride, glucose and albumin generated osmotic pressure.

13

Refer to Activity 4: Simulating Filtration- What characteristic of a solute determines whether or not it passes through a filtration membrane?

Molecular size

14

Activity 4: Which solute did NOT appear in the filtrate using the 200 MWCO membrane?

Charcoal

15

Activity 4: Which of the following was NOT observed during this activity?

Increasing the rate of filtration increased the concentration of solutes in the filtrate.

16

Refer to Activity 5: Simulating Active Transport- The ratio of Na+ to K+ transport is ____ Na+ transported out of the cell for every ____ K+ transported into the cell.

3; 2

17

Activity 5: What happened when sodium chloride was added as a solute in the left beaker?

There was no change in the transport rate of glucose.

18

Activity 5: Which of the following increased the rate of sodium-potassium transport?

Increasing the number of membrane pumps

19

What is the main difference between simple diffusion and facilitated diffusion?

Facilitated diffusion requires a carrier while simple diffusion does not.

20

What is the main difference between facilitated diffusion and active transport?

Active transport requires energy to move molecules against their concentration gradient, while facilitated diffusion move molecules down their concentration gradient and does not require energy.

21

All processes of moving materials across the plasma membrane are classified as either:

Passive or active transport

22

Processes that move molecules passively across the cell membrane include:

Diffusion
Osmosis
Filtration

23

The process of diffusion absolutely requires:

A concentration gradient.

24

Active transport and passive transport differ in that active transport requires:

Energy

25

Simple diffusion is defined as the movement of:

Molecules from areas of higher concentration to areas of lower concentration.

26

Ions and molecules in solution are in a state of constant random motion and collision (Brownian motion). This concept allows us to explain how a lump of sugar dissolves and eventually sugar molecules are found evenly distributed throughout a given container. This is a description of the process of:

Simple diffusion

27

The rate of diffusion is affected by which of the following?

temperature
pressure
concentration gradient

28

True or False: Facilitated diffusion requires energy in the form of ATP.

False

29

The only difference between diffusion and facilitated diffusion is:

Facilitated diffusion uses carrier proteins to move molecules in or out of the cell.